Imagination is the biggest mistake that most artists does that I did when i started out, I had the impression that great artists just pick everything from their mind and translate it into a picture, that I have to do the same thing as they do or i'm not good enough.
When you start out with art you have no library to pick from to create something believable or you have no understanding, understanding and visual library is what you should focus on when you start out, and continue to focus on through your entire art career,
I thought that some people can draw and some people couldn't I was terrible when i started out about four years ago,