It is true that when a picture one makes doesnt work sometimes it seems only to be a "tolerably good imitation of something else; in fact, to be a counterfiet". This is the feeling I get a lot when using Arnheim the software. Painting is a way of finding out what the eye likes. An indirect approach might be needed. I interrupt this review with a collection of my doodles to work along with Marion's ideas in her book.
Preconceived ideas about beauty may have a limit on ones freedom of expression. I've had a too determined wish to represent beauty too I think. If the computer does not know what it is thinking, can it find out by looking at its drawings?