I think they both look pretty great. It's a good clean style.

In the second one though I'm not sure what I'm looking at. You've got he cave walls and the open space and then that pebbly textured area which are built walls maybe? But they also read as a depth change so look like a moat sort of thing. I think it could be solved if you had avoided differentiating them from the cavern walls and they just flowed out (if they are walls).