Cover art. Frankly, 99% of the material out there that incorporates 3-d art is complete shit. So I’m conditioned to automatically NOPE my way away from anything 3-d rendered.
I’d probably be more interested if there was MS-paint pixel art instead of 3-d. I’m not saying you need to pay a ton of money to get a cover. Heck, you can make some pretty eye-catching pictures without much difficulty by abusing abstract designs or lots of shadows/darkness around the picture, but I would really suggest not using the 3-d models.