Yes, it’s fun to make final images. But they aren’t very good for learning, because anything could be wrong: proportions, gesture, shading, perspective, simplification, anatomy, color - or something else! That’s like listening to 5 pieces of music simultaneously. There’s just too much conflicting information. You need to remove as many elements as possible in order to see what’s truly wrong.

A photograph will tell you exactly how it is, but not what is important. Art is most interesting when the artist does try to tell you what is important. Like simplifying detail , exaggerating...