I really like this idea! Taking it one step further, you could personalize the view by prioritizing books on a user’s finished/reading/owned/wish lists.
I’d be ok with small thumbnails potential for mobile, but I do think that titles with hover over expansion is better for desktop. I think titles are more explicit and easier to understand even if images may be more beautiful?
I find images easier to understand than the titles (especially when there are multiple titles being compared), hence the suggestion. Kind of like how the Drag & drop difficulty grading request uses images rather than titles.