Those territory borders are still pretty darn squiggly, they look like jig-saw puzzle pieces.
That's still a pretty darn big mini-map, it could be a tad smaller (especially when it is such close proximity to the big map). It looks like mini-me or something, especially when the main map is only a few pixels away from the border as it currently is. For that matter, the main map may be a bit too big, but if you don't want to shrink it I'd suggest adding a few pixels around the border just so let it breathe a bit more.
Two things I thought I'd throw out there:
1. It might look nice if you project in some curved longitude and latitude lines in black or navy blue on the "sea blue" background and behind the game map layer. Particularly, the location of the arctic circle should be indicated, and the 40th meridian. I think that would fit in nicely with the theme you've got going, especially if you can make em reasonably accurate but show of the subtle curvature of the earth surface..
2. Since the actual proportional size of the glacier icecap is severely understated in the main map, could you try incorporate a more accurately sized icecap in the minimap and still have the minimap still tell it's info? That might also might help break up the "seeing double" effect you get from staring at the Dr. Evil / Mini-Me thing goin on there. And what if you tried to make the army drop circles look like snow drifts? Could look tacky but might give a nice effect.
, but this seems to be coming along nice graphically.