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. ;)