Cover art carries a massive, often subconscious, signal. Font choice is a huge part of it—that swoopy, cursive script screams romance from a mile away, while a distressed, blocky typeface often signals a thriller or gritty fantasy. I saw a fantasy novel once with a cover that was all soft pastels and a solitary figure in a flowing gown. I assumed it was YA fantasy romance, but the blurb revealed a brutal military-political saga. That mismatch made me put it back; the cover didn't prepare me for the tone at all. The color palette does heavy lifting, too. Desaturated blues and greys suggest a cold, tense mystery, while a vibrant, jewel-toned scene promises epic adventure.
Symbolism over literal scenes often works better for certain genres. A classic detective novel might just show a silhouetted figure under a streetlamp or a single, ominous object instead of a busy action shot. It creates a question. For romance, the specific embrace or distance between the figures on the cover telegraphs whether it's a slow-burn enemies-to-lovers or a steamy contemporary. The texture and finish matter in person, too—a matte finish can feel more literary or ominous, while a glossy, shiny cover often leans commercial or playful. It’s a whole visual language you learn to read after picking up enough books.