There is a lot to love on this cover. A mysterious building with good mood lighting, a limited color pallete, and a strong title font. The fact that the quote and the author name (and the tagline) are all in a bright white helps the readability, even at thumbnail size. I would have liked the title to be similarly contrasted, maybe with just a hint of the umber color. And a few more bright points in the image as well… but it’s still highly effective in informing the genre and catching the eye.