Have you ever looked at the picture on the outside of the book and decided right there and then if you were going to read the book or not? Did you ever stop to think about the fact that someone got paid to design that cover? Do you think you could do better?
Do any of these covers make you want to pick up these books and find out what they are about? Do any of them give you clues to what they might be about?
Would either of these books catch your attention? Can you think of a different way to create a cover for these books?