First ever Unreal map I've made... about half way complete, using default art assets from the UDK. Any crit is welcome for whats there so far.
For a first map not bad. I'd say the map lacks contrast in lighting, also given the time of day, there would not be any light cone effects coming off the lights in your 3rd screen shot.
Try to add in some color and contrast, and slightly tweak the high and mid tone settings of post processing to make your world colors 'pop' and feel slightly more real and plausible.