Harry Potter and the Methods of Rationality Cover

So this was a project I did in my Photoshop class last semester. The assignment was to make a cover for any book of choice. I chose the fanfic Harry Potter and the Methods of Rationality. My instructor was fine with it being a fan made book. He told me it was too busy. Now that I see it I understand what he meant... So what do you guys think?

Ps. I don't own Harry Potter, J.K. Rowling does.