Absolutely stunning color scheme :) This shows really well how shapes define the arid look instead of the color sheme alone, despite a lot of moist colors like greens and blues in the foreground it still feels arid.
You got to notice it rarely rains in desert... you could have drawn a sun instead. Though it's great and all but it more of reminds me of canyon rather than a desert.
this is really nice. I like your work with colours