Honestly, the cover image is the first thing my eyes lock onto when scrolling through reviews on Goodreads or Reddit. A bland text-only post just gets lost in the feed. If I see a well-designed graphic with the book's cover, some clean typography for the title, and maybe a star rating visually displayed, I'm far more likely to stop and read. It signals the reviewer put in some effort, which makes me trust their opinion a bit more from the jump. It's not about being fancy—just a clear visual anchor.
That said, a terrible, pixelated, or wildly off-brand cover graphic can have the opposite effect. I once clicked a review for a serious literary novel where the user had used a neon, clip-art style banner. It made me question their taste before I'd even read a word. The cover page sets a tone. A minimalist, elegant design for a literary fiction review feels appropriate; something bold and dynamic works for a thriller. It's a subtle cue about the reviewer's style and the book's vibe, helping the right readers find it.
Ultimately, it's about efficient communication in a crowded space. My brain processes the image faster than a block of text, so a good cover page acts like a high-quality hook. I'll spend more time on that review, and I'm more inclined to upvote or comment, which boosts its visibility for everyone else. The engagement loop starts with that visual pause.