The colors are nice. Making all the mountains gray does sort of say "all mountains are bare rock from foothills to peaks".

That texture works OK zoomed way out, but up close it isn't a super plausible mountain chain. Stare at some real satellite photography, and zoom in and out on it, to see what you might want to aim for. Of course you don't have to duplicate a2area's incredibly detailed stitching together of real satellite data - many of the satellite-view methods used by the Guild's Masters (and kindly detailed in tutorials) do a good job of suggesting real-ish mountain ranges.

What kind of scale do you have in mind for this?