Back for updoots =). I forgot to ask, how long did this take you? My first paints of environment were 20+ hours long, hahaha!
This is beautiful. OK, "rule of thirds", blah blah, but it's clear from your profile you know all of this and more -- way more, than I do.
What I especially like is how crisp this turned out, despite the lack of line work. The only thing I don't "believe" in this image is the mountain in the background, and I'm sure you'll sort it out as you go. Only tip? I think you could leverage a texture brush (e.g. dots, scattered lines -- complex brush) in combo. with a blender to generate sand and other "unknowns" a little more believably. I'm a big fan of shortcuts, and will share my brushes if you want to shoot me a PM. Best!!!