Nice work! I like it!
I'm more of a "realistic imagist" sort of artist (which doesn't make sense by the way), but I can tell you really know what you're doing. It looks much more stylised, with big, iconic mountains and hills and forests--and it really works nicely with the map. The color pallete reminds me of desert and badlands, for some reason--is that what you're going for?
It's great! I enjoy it quite a lot!