Why not paint outlines

Answer 1

Objects are three-dimensional, they don't have outlines. If you're unsure about this, look at your body and see if you've got an outline or if you're 3-D. You do have an 'edge' when you look at e.g. your leg, but as you move, so this changes. Instead of drawing an outline (or painting one) and then filling it in, paint the object as a whole.