^all good advice from waldo, heed that. You mention your end goal is UDK? I'd start compiling everything in UDK now. I never use Maya's lighting if something's going to be lit in-engine, because why spend the time to light something twice, you know? But waldo's totally right about the shadows and occlusion. Right now I…
Did a quick paintover messing with values a bit to solve the issue of the flatness Mostly it's working with the lighting to get the correct brightness. It should be brighter by the window and darker everywhere else, but right now the lighting everywhere is sort of the same value. Also try get some of the contact shadows on…
As everybody has mentioned, you don't really have a focal light source. The volumetric lighting is at the top of your latest render is kind of interesting, but now that default UDK lighting mode includes that, you aren't really showing off your skills as an artist. As one of my professors once told me, "You're relying on…