Shading will make parts that appear farther away DARKER.
For any art work, the parts that are nearer on the artwork will appear clear while the parts that are farther away will appear faint and light. The parts that are farther away can be shaded to make them them appear darker instead of faint.
Visual Arts I believe becuase this is the kind of art that you visually take it, like how with music you take it in with listening.
There is no painting below