The cave entrance is really well shaded in my opinion, though I would have made it a little bigger.
Good work with the underwater, it really seems more real now, still I suggest to make the water a bit more transparent.
The small sign it's nice as well but it took me a while to notice the death sign which is really perfect. I'd make the wood a bit lighter to increase the contrast. Probably the other sign as well, and I'd like it lower.
The big rock really show you're a master of dithering, I'm not completely sure about the so light veins, maybe having them a bit darker could improve it.
Anyway I see we're not so far from the complete status for this tileset
