Hmmm, interesting idea on the lighting, I'm going to have to keep that in mind going forward. Skylight! Why didn't I think of that!?

Thanks for the comments.

If you want good spotlights put your constant to about 100000 or so.

Texturing could be better also. Perhaps add some windows or glass texture to the surroundings walls. Maybe a ceiling sky light that shows some skybox texture could make things more interesting.

It is an improvement from your last map though.

Lighting is looking too white at the moment; vary your base lighting with subtle blues, yellows, and the like and don't be afraid to put in some more powerful colours as highlights. As for the architecture, there is some interesting stuff in there but the ceilings need work, particularly in the first shot.