Overall, I think it looks pretty good. The only thing that stands out to me is the apparent ridgeline for the northern mountain groups and along the chain extending from the northeastern portion to the south. If they're intentional, then it isn't really a problem, however, they do stand out just a bit and give me, and it could just be me, a wall like impression similar to, say, the Great Wall of China, but on a much larger scale.

You might also consider giving the forested areas a slightly stronger texture as well, just to help them stand out just a tiny bit more.

Still, on the whole, great job, and I'm looking forward to any tweaks you might add in just to finalize the finalized product.

GW