Personally i think there is no "direction" in your image. I tried to show that with the red lines. I would give the composition more definition for example in form of the crossed lines (green). I think the picture gets more depth.
Made the suggested changes from my fellow polycounters.. 1.changed my lighting and lit those buildings.. 2.blended the color of the bottom of the grass to match the ground better.. 3.changed the sign text to look more painted and not like graffitti.. 4.added a road from the foreground to the houses to lead the eye there..…
It's so bright, first i thought it is an antarctic scene. I would add more small stones to get the proportions right. 2 really good desert examples: http://www.gameartisans.org/forums/showthread.php?t=1185&highlight=vessel http://gameartisans.org/contests/uc/1/view_entries/finals_gameartisans_3d_333.html