I saw few things I'd change, this is my personal preference of course.
I'll concentrate on this screen shot cause it basically shows same things as others.
First of all i think the map look very good, i love the details and the abandoned atmosphere is great.
1. Big pipe in the middle of the room. First thing i noticed is the clean metal texture. Everything around it old, damaged and dirty. But the pipe metal looks new.
I think it should be rusty old metal. Maybe a painted metal texture that has paint peeling off. That way you can make a specular with more variety. Painted parts reflect while rusty material underneath is matte.
2. Sliding doors look really cool, but to me they don't really fit in with the rest of the map that is depicting an old industrial zone. I know sliding doors are preferred cause they're faster and don't require any action from player to open them except get close to them. But maybe make some of them permanently open? One side dangling half torn off, and the other ripped out, laying on the floor?
3. The lamp design is cool but you could have used rounded cylinders for those little bars and then vertex light the model. It would look rounder, smoother and a lot better. Frankie told me you're just learning hex and daz3D? SO i guess some of these things will probably be changed by the time the game is released.
4. The bulb is emitting light, but it looks turned off.
5. I really hope those lockers are normal mapped. Even though those are all misc details they're quite big and players will notice them. And they would look amazing with a nice normal map.
6. That looks like a bump map. You can see on the edges how the tile looks soft and rounded, while it should look a bit sharper.
I'd definitely use a normal map instead of a bump map. You can have sharper edges, better specular and with occlusion they will have proper depth and look more natural.
7. The wall texture looks really low res. Which is fine for walls that are above ground or in places players can't get this close to them. But on walls players can literally stick their nose in them i think the resolution should be a bit higher.
The map has a lot of windows, and even though they're nothing that important a low resolution (256) normal map would give them some shine and they'd not just look more realistic but also give the map more "life".
IMO i would replace all the bump maps with normal maps, i only use _b maps for parallax mapping. Blue channel occlusion can give depth to a texture a _b map never can.
I've noticed almost all of your indoor lights are on the ceiling. And then you line up 3 red lamps on one side of the ceiling and 3 white lamps on the other side to light up the room. I'd put some on the wall, just to break it up a bit and in the same time you can make the light a completely different color.
Maybe an exit sign that emits green light? Or something like that.
However on the other side the map has fantastic background depth. Its not like other maps where you hit the wall and there's nothing behind it. The damn in the distance looks great.
Texture look superb, buildings connect seamlessly, all in all the map looks great. Can't wait to play it.