I hate what I just wrote. But I refuse to take it down. Somewhere in there is what I'm trying to convey. Not sure I can. No natural ability? Huh.
Okay here we go: successful art is like a successful argument. And some people are really good at making successful arguments given whatever vocabulary they have. Others can talk and talk and talk, but no matter how much they work at it, no matter how much they improve, no matter how big their words are, they will never make a successful argument. Because they just don't have the requisite intellectual equipment. So it is with art. Some people can use whatever medium they want, they can take all the classes in the world, they can paint with technical proficiency, but they will never illuminate anything or convince anybody of anything with their art. Inborn ability.