I also agree on the waterlines, which seem a little strange, and continue onto the land at one point. The mountains are good though I think could do with having some of those thicker lines replaced with slightly thinner ones just to break them up a little.

All that being said, I think it has a great overall look to it! So nice work on this Matthew, keep it up and fix those little nitpicks and I look forwards to what else you come up with!