It isn't sufficient to say "composition". Anyone can study all the rules of composition and then go out and apply them, and make a bunch of textbook, perfectly composed, crap pictures. I would prefer to say the important things are seeing, creativity, and honesty. Aesthetics have to be in there somewhere. Note I'm referring here strictly to the image and the photographer's visualization, even before image capture with the camera. So I'm excluding any kind of technical skill and printing.