Does this sound like you?
"...the unique discipline that characterizes the artist - an inner control in which deep satisfaction and dynamic dissatisfactions alternate to stimulate continued growth. Through such discipline the art student discovers and reveals personal abilities, establishing the basis for mature artistic expression."
Mendelowitz's Guide to Drawing, p. 16
I think it rather hits the nail on the head! Forgive me for the second post without an image, I've been working on drawing the skull from different angles from memory - with a little drawing from the tv thrown in. That, I must say, was an interesting exercise, one that I must try again.