The fantastical cover
I have two things to admit: First, that I read fantasy. And second, that I feel no shame in this. I believe firmly that there is something to be learned from any book, be it good or bad, literary or otherwise; I’ve banished the phrase guilty pleasure from those I use to describe different aspects of my reading habits. For example, while I know that world description is a huge thing for some readers, reading fantasy, more than any other genre, has taught me how much I hate long-winded descriptions, and so I leave this out of my own stories, because I don’t want my readers skimming entire pages.
But while I enjoy some fantasy (yes, certain works are horribly formulaic, and I don’t like that in any type of writing), I despise most fantasy book covers. With few exceptions, they seem to me childish, to play into fantasy archetypes rather than to break them, and to have too many design elements competing for attention. Not to mention I hate having a character’s cover image fighting against the one I develop in my own mind. These complaints, of course, go for any genre of books, but I tend to see these problems most in the fantasy books, where simplicity is almost always discarded in favor of chaos and where the cover seems to be more interested in making the book fit into the fantasy genre rather than making it stand out.

