It might help if we knew what type of genre you are aiming for. Then we're able to make more informed critiques.
Unless you're trying to decide if it's giving the correct genre-vibe... in which case I would guess dark, maybe love-based stories? Or poems, based on the first image.
My personal preference is the dead body, though I'm not sure who well it would transfer into an ebook without being able to see the whole form on the cover. I like the border on the first (though I would consider bringing the title down a bit more). So... maybe a combination of the first two?
But I'm not sure what the genre dictates, so I'm not sure which one would work best for attracting your audience. There is definitely a dark, quirky vibe to the art style, which is growing on me the more I look at it.