Hey there!

So first of all, I'm going to talk a bit about your terrain. Like I have said in the past, I really do like the stalactites coming from the ceiling and the ground. They're super original. But I think you need to mix more block types in with the stone. If you can come up with a good palette, I can w/e it all for you so you don't need to hand replace everything, if that helps. I think you're going to need some diversity in with the stone because otherwise it's so washed out.
I also like the lava ravine. It adds light to the dark cave.

Secondly, your structure. I like the structure closest to the entrance of the cave. It has really nice detail and depth, and the palette works okay with the rest of the plot. The other houses are also okay. You could ease up on the detailing a little bit on them but that's not too much of a worry.

Lastly, your organics. I like the trees you have. They have a good shape and work with the plot. Also the Lionel fireflies are adorable and made me laugh a lot xD They're great.

I do think you definitely need more light around your plot though, and definitely more colour. But that can be added when you decide on a block palette :3

Good luck!
- Dutty :3