Looks great - I love the colour scheme.
There's some weird horizontal/vertical striping on the Vantas and Neha mountains. Is this an artefact of the angular gradient fill that Gimp uses? If so, perhaps a little judicious smudging or a blur would get rid of this.
Also, perhaps a little curve on some of the names? The labels are a little angular at the moment, and a little curving of the text to fit the regions might help it blend in a little.
Well that's just because you asked for advice, but really what this map deserves is praise! You've done a great job. It looks lovely (and I'll turn a blind eye to your rivers flowing over hills and mountains just this once ).