Those textures are very well detailed. Since I don't even know half the programs you used, and am not very experienced with the rest, take this with a grain of salt, but maybe it will help. The rivers look to widen out in the rocky/snowy terrain before flowing down to the plains. I think its an illusion, but its there non the less, so the rivers could use some trimming up. For that matter, you have a plethora of rivers flooding the continent, and for artistry's sake you could trim some back. If the point of the story/game is river exploration then obviously keep them, but otherwise the map is better served with only the major rivers. Finally the land is done with such detail, and then the ocean is left a flat blue that it's distracting, hit it with some texture or other.
Oh, and awesome compass.