I like the forests. The sea seems a bit flat compared to the land. With that must texture on the land, I'd texture the sea as well. The mountains feel a bit unnatural to me. Maybe add some irregularity so that the ridge line of the main range doesn't form such a smooth arc. Your river system is... unnatural. See http://www.cartographersguild.com/sh...he-right-place for the basic law on rivers.