Two words: futuristic nostalgia. This is just so great. I can imagine a kid looking upon this afternoon landscape through a dining hall window completely unappreciative of its beauty, because he'd rather be at home back in Tavor-2A than here on boring Earth where his Dad works.
I saw your sketchbook on concept art, mad props man.
I like the way you integrate skies, it looks so natural and effortless.
Very modern and sophisticated architecture!