This is a very impressive map!
I am more of a dreamer and world-creator than I am a mapmaker though, so I don't know how geographically correct the map actually is, but either way, the textures are very nice, and the overall style is really neat!
The only small thing that came to my mind while I looked at the geopolitical map is the country borders. I don't know how you have envisioned them, but many natural borders (like rivers!) that could be used to create the shape of the country are left unused.