Really good layout/vista!
Composition is grand and feels natural.
You should keep on with this one. Detail the ground more and add a complex and natural plant-scape to it. It needs lots more plants.
IMHO I think it would be cool to see you move the color pallet from a desert scheme to a more northerly impression.
And with a sky line like that, you could do a lot in the way of science fiction.
JUst my thoughts. If you like them, than of course I was right. And if not, I am simply exhausted after a grueling work week, and cannot be held responsible