[BookCat]

If I were perusing books on Amazon, I'd skip this. The brightness hurts my eyes.
All along in these designs you've ignored the rule of thirds (the golden rule) and the title has taken up almost half of the length of the cover, instead of a third.
Personally, I would have like to see a sepia version of the original picture of the guy in bed, with some way of making him look alive (maybe his eyes are open and his face is expressive). The title background should have been a much more subtle, paler yellow, like a pale morning sun made even more mellow to blend with the sepia; this should take only one third of the length of the image. I like the tag line and would have placed that either just below the title, or just above the author name.
This would have looked more menacing imho. The current version is too cheerful for the genre.