Well...
Its a box. The whole map... or it seems... you could try and get more things at the walls - even if pointing for a concentration-camp-type-of-thingy, you could add extra barracks or other buildings, so that it won't immediatly look has a cube.
Again, if you're into "realistic" look, you could reconsider the buildings construction - i mean, made them look a little more real, even if just abandoned brick constructions.
The room with the Redeemer seems just corny. It's not real and it has a bunch of usuall junk some people throw in to make it look good. It's not. Get rid of it. If that's a sample of what you did/will do for other rooms, then re-think.
NOTE that i had in mind that textures are not definitive, and that this is but a "demo" - if you will - of what you´re doing.
The best thing in it though, is that "real" looking pond with the stream coming out of it (or is the other way around
). Did you use that black/white 2D image tool to make it? I bet you did.
Other thing is, the 2nd picture. It shows what you SHOULD NOT do in the open, meaning, a bunch of trees without anything else, and on flat terrain (c´mon!). Also, the lava "fountain" with the Nali. Not good. At least change it to water...
That's my opinion.
I hope you take it has a constructive crithic (spelling?), as i'm not here to bash your work, just to help make it better.