Another simple scene, texture of planet in the sky from the late and lamented Mojo World.
Interesting scene... maybe the vegetation on the canyon walls could do with a little more slope constraints to keep them free of veg? (unless that's what you were going for?)
Looks great, colors seem a bit... off. the Mountains seem to be entirely covered, and then don't. I think either base colors could go darker, or such. wonderful idea though.