Colour filling and blending

Correct answer: D. Add sudden colour contrast and controlled hard boundaries in selected areas

Explanation: The governing concept is expressive use of edge and colour contrast. A composition gains visual tension when selected areas interrupt an otherwise calm flow with abrupt hue or value changes and deliberate hard boundaries. Option D is correct because it increases energy without flattening the entire image. More softness, isolated white, or universal greying would generally reduce contrast and make the mood calmer rather than more tense.

Correct answer: A. Vary transition edge and colour-layer quality according to each material

Explanation: The governing concept is material-specific control of edges, layers and surface texture. Different materials reflect and absorb light differently, so a painter should vary softness, sharpness, opacity and layering according to the observed surface. Option A is correct because it restores visual distinction. More uniform blending, one shared colour, or a white glaze over everything would increase sameness and obscure material differences.

Correct answer: B. The paper's absorbency or moisture differs across areas

Explanation: The governing concept is surface consistency in a wash. Evenly loaded paint can still dry darker or lighter when sections of paper have different absorbency, sizing or moisture; a wetter or less absorbent area may retain and spread colour differently. Option B is correct because it explains the uneven value without changing the brush load. The other choices are labels or subject judgements, not physical surface causes.

Correct answer: B. On the combined effect of evenness, edge control, tone, colour relationships, surface, medium, depth, mood and compositional purpose

Explanation: Comprehensive evaluation follows the principle that technique serves visual purpose. Judge whether fills are even where required, edges are controlled, tones and colour relationships support depth, and the surface and medium are handled appropriately. Also consider mood and the composition’s intended effect. Counting colours, measuring brush size or judging brightness alone ignores too many factors to describe the actual quality of the work.