Ideas on what to add to fill empty space

[hydraxic]

I’m currently building a lobby for a dropper tower of hell game, and I’d like ideas and suggestions for what to add/change to make the lobby more appealing and interesting. Currently it looks empty and bland, but I don’t know what to add - I’m not really good with these things. Here’s what the lobby looks like:

The hole is where the dropper starts.

Any suggestions appreciated!

[Hazelfluff]

maybe add some color and texture to the walls and floor?

Unless there is a reason why they are gray.

Considering that you have added trees and grass, maybe add some flowers and rocks too.