I guess when your job involves explosions, lasers and bugs that make the cockroach on the wall look like a grain of dust in comparison, then a peaceful day is probably deafeningly quiet. lol
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Very solid piece! The characters look great, and the rocky background is masterfully done.
The dust in the forefront is looking kind of smudgy though, and it's blocking out all of those painstakingly drawn plateaus and rocks.
If there was anything I'd suggest, it would just be to use a different type of brush with the dust layer, or maybe lower the opacity ultra low to keep what's already there, and then have a second layer for thicker dust that doesn't appear in front of some of the best rock details.
But hey! That's just me.
Great work dude! :D