Veery nice!
This cave tileset does a lot to complete the overall set. If I were to nitpick I'd say you forgot to add in some "fade into the abyss" tiles so that one can make deep dark pits. But otherwise it's a pretty complete cave set.
I see you also added in a waterfall and some cave water tiles (which you should've shown off in the screenshot)... but the water is still static though. Maybe at some point we get that animated water, even if it's a very simple 3-4 frame loop?