The "essence" of comics is fundamentally the weird process of reading pictures, not just looking at them. I see the black outlines of cartoons as visual approximations of the way we remember general ideas, and I try to use naturalistic color underneath them to simultaneously suggest a perceptual experience, which I think is more or less the way we actually experience the world as adults; we don't really "see" anymore after a certain age, we spend our time naming and categorizing and identifying and figuring how everything all fits together.