First of all, welcome to the forum. Good to have another user presenting him(her)self here.
It's best to post a render of your work, because the object is missing. So we can't really tell the mood and light effect. One thing I noticed is the total flatness of the wasteland. I would definitely add some small fractal displacement, and/or fake stones, or cracks, to the tops to make them more natural. Unless, of course, the flatness is intended.
Ah, after posting this, I saw your image popping up. By the way; some time ago, Planetside posted their request to keep data use small, so there's a preference for jpg's instead of png.
Have you tried more cloud behind the object to obscure the horizon? And perhaps a sun more or less behind the object with the lens flare would make it more spectacular. And I would add some strata to the valleys/ravines, not evenly, but one or two shaders masked by a power fractal. Perhaps even some strata colors/bands.