Pretty cool Banni.
You could probably do a few things to add some detail but my suggestions are minimal. Probably the most noteable things that come to mind would be making the perimeter wall concrete just to break up the blue brick tex some.
Maybe some roof vents, would just add a little and give players somewhere to hide.
Open the wood garage for players to hide in.
Maybe a tall lookout tower to give the whole scene more vertical volume.
I think it's pretty good as is though. I felt the same way as you, I could've spent hours more adding little details and whatnot but it got to the point where I had to say enough's enough