looking very good moose. i wouldnt say the floor looks bland, but it lacks stuff, it seems quite big and its just one hallway with nothing in it. Im assuming your gonna add more though.
But anyway looks excellent, it definently doesnt look like a beginner map.
Tips.
the lights on the walls are cut off, im not sure if thats intentional or not but either way they look cut off. If it a matter of size, higlight the light, hit S, then a window will come up called surface inspector. Click on Fit, and the texture will fit to the brush

(BTW theres to fit buttons, im not sure which on it is, so if one doesnt work try the other)
One thing to make sure that you dont change. Is your lighting, your lighting is perfect, make sure you dont change it.
And as mentioned above the hallway lacks stuff. And when your adding "stuff" make sure you do it intelligently, thinking about how you can help dretches etc.