The map itself looks good. Not a big fan of the border frame though. Perhabs a dark outline of 3-5 pixels applied to the outer and inner edge of the grey would be nice. That's just me though. Oh, and the river system looks good, but they could probably do with with a soft toned outline as well, like in the coastal area. At the moment they kind of look as if they overlap and don't have depth to them. Other than that it's a very cool map.