What will be useful to show the effect of a leather surface?

Correct answer: Slight wrinkles and shine

Direct answer: C, slight wrinkles and shine are useful. Texture is the visual or tactile quality that helps us recognise a surface. Leather is often suggested in a drawing by controlled surface details such as small wrinkles, creases, pores or seams, together with highlights that indicate a somewhat smooth or polished surface. The details should be appropriate to the kind of leather; not every leather surface has the same amount of shine. A is unrelated because an empty sky does not describe a leather surface. B is a colour reference tool, not a surface-detail method. D removes the variations needed to communicate texture and makes the material look flat. Texture should be shown selectively: too many random marks may confuse the material. Memory cue: material identity comes from relevant surface details, not from colour alone.