That's a great start, what software did you use? I like the rough mountain texture.

Couple of comments (though admittedly I'm no master mapper)--tone down the bright green on the coastlines just a tad. If you're using photoshop, you can use any number of adjustment layer options to help with that (saturation, brightness/contrast, etc.) along with a layer mask and it should do the trick.

I thought the green "hole punch" fill you used for the forest texture was a bit distracting; maybe look at a different type of fill or brush for that?