Body art is like bacon apple pie. You have butter, sugar, water, flour, apples and BACON but if you don't have enough of something, it isn't quite right. You still have bacon apple pie, but it's just not very good.
So with body art you build a piece with ingredients of contrast and composition. Lights / darks ... hard lines or edges / soft lines / edges ... warm colors / cool colors ... texture contrast ect. ... An example of