Great job...very realistic. No suspension of disbelief required, as far as the geography goes! Only a few things I don't like:
1. The mountains are a bit blurry for my taste. When the image is scaled down, they look outstanding, though.
2. The lava (I think that's what those red spots on the mountains are) looks a bit fake.
3. Why does the legend box say "Regional Map?" Just seems like a strange thing to put there...it's pretty obvious that what I'm looking at is a regional map.
These are pretty small nitpicks, though. Everything else is beautiful.
What software and techniques did you use?