Ugh, this is gonna be tough. I have to make it look worse? j/k
I agree with you on the color thing. One reason I don't have more color variation and such is because I just haven't gotten that far yet. I made this entire area yesterday, and with all the custom textures I had to make it was kinda crazy. However, I did want to make it have a very sterile feel because I feel that the final point on maps like Well are very run down and dirty which is more like a missile silo than a space station. A space station to me would be very clean, especially in the 1970s. It also gives the idea that people are there if it is clean, as opposed to the exterior where it is very decayed as if it was abandoned for a long time. If you think the screenshots look like a NASA station, then I would say I did pretty well because thats kind of what I was going for.
Different materials, definitely. As I said up there---^ I just haven't gotten that far. In my initial idea of the area, there was suppose to be very little black, but I had no other textures to use so I just plopped the black down instead.
I think the architecture only needs slight changes, as the modern look is more due to the textures than the architecture. As I said before I also wanted to stay away from the clichéd spytech stuff as much as possible.
I shouldn't have problem blending the exterior/interior, heck, I might even avoid it. It might add to the effect of the facade if your suddenly transported from a coal mine into a space station.
I still have a lot to work on. But it'll definitely get there. If any of my reasoning sounds ridiculous, feel free to point it out.