In the fall of 1977, fresh out of high school, I entered a college commercial art curriculum. Admittedly, my attendance at my evening Art History and Composition classes was somewhat 'spotty'. I was ill-prepared (that sounds nicer than "too emotionally immature", don't you think?) to take college seriously at that time -- so suffice it to say that I felt I had better things to do than spend evenings in a darkened auditorium viewing and discussing slides.
Since resuming my drawing about five years ago, I have become increasingly aware that I struggle with issues around creating a successful composition. In other words, I have gradually come to know how much I don't know. Despite techniques using sketching, cropping, etc., I have difficulty visualizing and objectively analyzing what an image may look like when completed. Consequently I may be well into a drawing before realizing, "Oops -- that's a problem." Even then I may have difficulty identifying exactly what the problem is, let alone how to fix it.