Colour filling and blending

The governing concept is consistency of stroke direction for an even painted surface. Strokes moving in many directions can overlap irregularly, reflect light differently, and leave visible streaks or texture. Therefore, option A is correct. They do not always darken the colour, clean the brush, or physically reduce the paper. Using an organised direction, suitable pressure, and an even paint load helps create a smoother background.

The governing concept is tonal gradation, in which a gradual change from dark to light suggests atmospheric depth. A darker upper sky and lighter lower area can make the scene feel more spacious and distant, so option B is correct. A smooth transition is important; a flat sky would result from little tonal variation. The effect does not make the whole sky black or remove clouds, because those depend on the actual colours and forms painted.

The governing concept is tonal modelling. A darker tone near the central vein and a lighter tone toward the edge creates a controlled value change, helping the viewer read the leaf’s surface, form, and slight curvature. Thus, option C is correct. The treatment does not indicate the price of the leaf, paper thickness, or brush size. The artist should keep the transition gradual and consistent with the assumed direction of light.

The governing concept is tonal separation and modelling. Light-dark values and soft shadows show where one petal overlaps another, creating depth without depending on a heavy outline. Therefore, option D is correct. Merging all petals removes their separation, painting the flower black hides useful value differences, and removing the background does not define the petal forms. Subtle shadows should follow the imagined light direction.

The governing concept is edge control during colour filling. A small brush gives greater precision, while reduced moisture prevents excess paint from flowing beyond the boundary. Therefore, option A is the most useful correction. More water increases spreading, fast long strokes reduce control near corners, and pouring paint from above makes accurate placement impossible. Working slowly near the edge and using a suitable paint load improves neatness.

The governing concept is a transitional or intermediate colour in blending. When two neighbouring colours meet with a harsh boundary, a related middle hue can be placed between them and worked gently across both sides. This creates a gradual change instead of a sudden division, so option C is correct. Equal colours need no bridge, and options B and D do not describe a blending situation that requires an intermediate colour.

The governing concept of gradation is a continuous change from one tone to another without visible bands. If step boundaries appear, gentle strokes while the paint is still damp can soften and connect the neighbouring tones. Hence option B is correct. Black lines emphasize the divisions, erasing is unnecessary, and a thick layer may make the bands more obvious rather than smooth them.

The governing concept is tonal modelling: changes from light to dark communicate form, volume and the direction of light. Adding highlights and shadows in tones that agree with one consistent light source gives a flat shape a three-dimensional appearance, so option C is correct. A thick outline, one uniform colour and isolated white dots do not adequately model the object’s volume.

The governing concept is controlled wet-edge painting. When paint dries quickly, working on a smaller section and preparing enough colour in advance allows adjacent strokes to meet while they are still workable. This produces a more even fill and makes blending easier. Heavy rubbing can damage the surface, a dry brush does not solve rapid drying, and stopping after every stroke creates visible joins. Therefore, option D is correct.

The governing concept is colour purity. Brightness is preserved when clean pigments are mixed only as much as necessary and the brush does not carry muddy residue from another colour. A clean palette also prevents accidental dulling. Adding black usually reduces brightness, repeated rubbing can disturb the surface, and mixing every colour together produces a muddy result. Thus, option A gives the best practical method for maintaining clear, lively colour during blending.

The governing concept is protection of the paper surface. Paper fibres rising means the surface is being overworked, usually because the brush is passing repeatedly over the same area or pressing too hard, especially when the paper is damp. The correct response is to reduce pressure, limit repeated strokes and allow the area to settle. The other choices do not explain visible fibre damage. Therefore, option D is correct.

The governing concept is planned colour experimentation. A blending sample chart records which colours, proportions and moisture conditions were used, so the resulting shades and transitions can be compared before applying them to the final work. This helps the artist choose a reliable mixture and avoid waste. It cannot draw automatically, eliminate brush cleaning or change paper size. Therefore, option A is the practical benefit.

The governing concept is evaluating the visible result rather than the cost or label of materials. High-quality colour filling should cover the area evenly, keep boundaries clean and create smooth transitions where colours meet. These criteria assess both control and finish. Paint price, brush size and the title may be relevant to other decisions, but none alone proves technical quality. Thus, option B provides the most complete and suitable basis for checking the work.

The governing concept is the neutralising effect of complementary colours. Colours opposite each other on the colour wheel can reduce one another’s intensity; when they are mixed too much, their combined pigments often produce a dull grey or muddy middle. Limited mixing preserves separation and brightness. Too little blending would usually leave a sharper boundary, while brush load or dry paper alone does not best explain the grey colour. Therefore, option B is correct.

The governing concept is controlled colour blending: repeated strokes at the meeting area can deposit extra pigment and form a darker patch than either neighbouring colour. Therefore, option A is correct. A clean brush, limited paint, and a flat surface generally help control blending; they do not normally create a dark central buildup. Use fewer, lighter strokes and blend while the paint remains workable.

The governing concept is value modelling: a sphere appears three-dimensional when light, middle, and dark values follow one consistent light source. Thus, option C is correct because the lit side is lighter and the opposite side gradually becomes darker, with a smooth transition. A uniform colour gives a flat appearance, while a black centre or unrelated colours does not describe believable illumination.

The governing concept is controlled gradation in opaque media. A light-to-dark sequence stays cleaner when one base colour is changed gradually with white or a carefully selected dark colour. Therefore, option B is correct. Mixing many opposites, blending every value together on the paper, or using a dirty brush introduces uncontrolled pigments; these competing colours lower clarity and produce muddiness.

The governing concept is controlled watercolour layering. Because wet paint reactivates and carries pigment into nearby areas, a second layer placed too soon loses its edge and spreads. Option B is correct: let the first wash dry completely before applying the next controlled layer. More water, tilting, or dark paint would increase flow or merely hide the problem rather than correct its cause.

The governing concept is a gradual value transition. To move from a dark top to a light bottom, progressively reduce the amount of concentrated paint and introduce a lighter mixture as the brush moves downward. Therefore, option C is correct. Increasing paint or keeping a thick dark mixture prevents lightening, while unrelated colours break the unity of the background instead of producing a smooth gradient.

The governing concept is complementary-colour neutralisation. Complementary hues contain strongly opposing colour tendencies, so mixing substantial amounts reduces chromatic intensity and can produce a neutral brownish, greyish, or muddy result. Therefore, option B is correct. The mixture does not normally become brighter, turn into pure white, or become transparent; transparency depends mainly on the medium and dilution, not this colour relationship.

The governing concept is edge control. A hard, sharply defined edge attracts visual attention and can describe a nearer or important boundary, while a soft edge reduces emphasis and may suggest distance, atmospheric loss, or rounded form. Therefore, option B is correct. Edge choice does not change paper thickness, automatically darken colour, or make every object equally flat; it organizes focus and spatial depth.

The governing concept is preservation of colour purity during blending. If incompatible or complementary pigments are repeatedly mixed in the meeting zone, their opposing colour tendencies neutralise one another and can create a dull grey band. Therefore, option A is correct. Clean water, light strokes, and separately prepared mixtures generally improve control; they do not normally produce a grey strip unless contaminated by excessive mixing.

The governing concept is a controlled tonal scale, in which value changes are arranged from lighter to darker or darker to lighter in an intentional sequence. Begin with the same base colour and add measured, gradually increasing amounts of white or a suitable darkening colour, keeping each mixture separate and labelling the order if needed. Random additions or one shared container destroy distinctions, while guessing on paper makes comparison difficult. Option B is correct.

The governing concept is consistency of mixture across one continuous painted area. Prepare enough paint in advance and mix it thoroughly so the hue, value, and thickness remain stable from the first stroke to the last. Making a new mixture for every stroke introduces variation; changing brush sizes affects application, and adding water midway changes dilution. A small extra quantity also prevents a shortage that would force an inaccurate remake. Thus option B is correct.

The governing concept in a continuous gradation is complete, slightly overlapping coverage. If adjacent strokes do not meet, the unpainted white paper remains visible as narrow bands. To prevent this, maintain a wet edge where appropriate, overlap neighbouring strokes slightly, and keep the paint flow reasonably consistent while changing the blue gradually. Sufficient blending, a wide brush, and flat paper normally help rather than create white gaps. Therefore, option A is correct.