Very interesting: the red buttes and the town of Green River look like an old hand coloured photograph, and the sky is surely something else. (Had family in G.R., going way back; this is very evocative of my visits there).
A tiny bit less land a more sky would meet the challenge better I feel. I appreciate you've gone for the rule of thirds, but I'd be looking for the rule of 9ths maybe :-) That said, I don't feel that it is DNMC so won't be docking any marks.