I took a Production Design Class at Gnomon School of Visual Effects in Hollywood. On the last day of the class, after all of the students left the room I walked over to the instructor, John Mahoney and asked him to look at my sketchbook. He flipped through the pages and said, "Your drawings are cool." I did not accept this, so I asked him to look again and be brutally honest - "I can take it" I said. He opened and closed the book and said, "your drawings are terrible." Now that's what I was looking for.
I asked him to coach me privately. At first he was reluctant but in time I wore him down by showing up wherever he was and constantly nagging him for advice and critique of my work. My plan worked!! I started intensively practicing the exercises he gave me as if I was training to be a Jedi (in my mind I actually was).
A word from my mentor John Mahoney