This looks really nice but here are a few things that I'm seeing:
1. tiling in the mountains...there's a regular shape that keeps popping up that seems to produce hills in a horizontal direction.
2. forests look great but maybe a .5 pixel blur will take some of the crispness out, dunno, I'd have to see, maybe .3.
3. rivers look fine, if you made them any thinner you'd have to increase the brightness so that they won't get lost or put a dark outer glow around them.
Anyways, those things aside, this is very nice and I'm a tad jealous, I must admit. Keep up the good work.