Hey there!

First off, lemme start with your terrain. I love the idea of having stalactites and stalagmites coming from the ground and ceiling, however I feel like they could be made from a ice/stained glass palette, to make them more crystally. Having everything as stone right now is washing out the build. Other than that, I have no issue with the terrain, and I like the contrasting lava with all the stone. It makes it stand out a lot more.

As far as I can see, you have no organics. A nice organic here or there can be really good for a plot. Although, I'm not sure what kind of organic you could do on this plot, but originality is key! I'm sure you'll think of something. Maybe, you could turn this into an enchanted theme, and make a small dragon guarding an egg or something, up to you! :3

Lastly, structure. I like the positioning of the structures but the detailing looks strange. I think it's largely your palette, the oak stairs look too contrasting with the stone brick in the way you have placed them. As well, the depth you've applied with the various layers just unusual. I think it's also your shape, your design and your roof styles. You have three different styles you're going for in each build and they don't make sense with the rest of the plot. I think you really need to think of a style of building. If you want to go with the enchanted theme, pointed roofs and lots of purple would be a nice idea!

Good luck!
- Dutty :3