I'm impressed, I must say how much I like this mixture of space and terrain art, i'd say you and rabieshund seem to know exactly how to do it. One thing i'd do is sharpen it a tiny bit. Sharpen everything once except the grass. The grass kinda looks a bit plain though, hmm ok give it a dreamy glow look, if you know how to do that. Problem with the sky aswell, I can see a straight line where it shows you used the clone tool.
