What does variety of shapes increase in a picture?

Visual interest

Variety means using different kinds of shapes instead of repeating exactly the same form everywhere. Differences in size, outline, direction, or character can make the viewer notice more parts of a picture. They can also prevent the composition from looking dull or mechanical. A thoughtful mixture of circles, rectangles, organic forms, and other shapes can give the artwork rhythm and visual interest.

Option C is correct because varied shapes make a picture more engaging to look at. Paper thickness and frame price are physical or commercial matters, not results of shape variety. A drawing has no literal sound, so the last option is unrelated. Variety should still be controlled: too much random difference may cause confusion, but suitable variation makes the composition lively and interesting.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Shape.