for the emboss on the rivers, have you tried setting it to chisel hard? you should only need a 1 or 2 px bevel for that, and it should come out with sharper edges, that seems to work well for me, anyhow.
Speaking of bevels, have you tried playing with the contour settings under the bevel options? (not the gloss, but the subcategory you see on the left) That might help your mountains transition just that little bit smoother.
Darn fine though, overall. And I like the forested mountains, that effect turned out very nice!