it still looks to me like a Mesa-range instead of a mountain range. There is a flat face in the mud, at the highest elevation (of the displacement) planar to the truck panel its on. I don't know if you can fix it, but i think having patches of completly white on the displacement map, may cause it. Try to keep everything in the grey range?
The colour is looking much better, although some varicence in colour might look a little more natural.
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