I’ve been playing some more with lighting and shading and I’m getting closer to a look I think I like…
Here are some screenshots that I took while walking around a newly generated cave!
I’m looking for more ideas of how to fill these. Any ideas welcome! (Roots? Plants? Corpses? Skeletons? …)
Those caves look really good already, I do feel, and the lighting is a significant part of that I daresay!
As to other things, your suggestions seem like they could work, indeed. Other that those, I might suggest mineral outcroppings or veins, crystals, small cave fauna, and (if applicable) stalagmites and stalactites.
Beyond that, I might suggest embarking on a bit of research on the sights that may be found in caves–perhaps you’ll discover further ideas that way!