The Job of a Book Cover

For my book cover contest for NICE GIRLS DON'T BITE on 99designs, I was focusing on a cover that had bright color contrast and could be easily read in a tiny Amazon icon. A writer friend of mine wrote that she thought none of the submissions said, "Pick me up and read me." Hmmmm. Food for thought. I was satisfied with a cover that was readable and reflected that the book was a hoot, not a horror. I was assuming my "compelling description" would say, "Pick me up and read me." Anyone have any thoughts on that subject?