the sand is amazing. the sky is too colorful though. i'd like to see it with a dimmer/yellowish color to set the mood to by in war time. looks too much like teletubbies/winxp sky right now.
and the guys running on the right. hehe. real ppl who're running quickly won't run like that. they'll have their bodies more on the front, to shift their weight. this looks cartoony. or maybe you didn't plan to make them run quickly?
The pic is beautiful, but the effects are what make it so. Color is good, and the sand coming from the top of the dune is excellent.
I can't really tell that these are anthros, but hey, we'll take your word for it.