Here are my comments/suggestions on your map.
Love the cell block and the orange lighting you used to make it look like the TF2 logo.
You nav map should maybe not have the skylights unless you can get up there just so people dont think there is something there in the playable area.
The cell block has a lot of empty space so try and liven it up like some decal arrows on the ground like a trail. And the same to your courtyard maybe a cluster of bushes and trees that people can try and hide in.
Your pool, a diving board, a shallow end, steps to get in. Little things that add atmosphere.
Your climb here decal looks messed up and for the rest maybe use transparent decals or frame them so they look more natural.