I love looking up concept art, interpretations, or even fan art when ramping into a book / audiobook. It adds atmosphere, contextualizes characters, and makes it easier to imagine complicated concepts and scenes. The trouble is that it's almost always a terrible idea. You'd be hard pressed to think of a better way to catch unwanted spoilers than blindly Google'ing for story images.
Just this year, I badly wanted to image search Three Body Problem to help imagine the surreal scenes in the first book. No doubt visuals would have added a great dimension to the experience, but I felt I had to force myself to do without until finishing the series. I had a similar thought reading Log from the Sea of Cortez. Steinbeck chocked it full of beautiful descriptions of dozens and dozens of sea creatures, and I'd have loved a way to see individuals while I was reading without putting the book down to google, deconflict, and find my page again.
Someone should make a platform that gives you images based on where you are in the story. Enough to aid imagination without spoiling the whole tamale. For Audible in particular I think this would be a great feature. Think something akin to Spotify's music visualizations.