Looks good, but I have a problem with either the heights, or some of the rivers. The dark rough patches, to me, look to be mountains and thus higher than the light colored areas. I think this is correct, however that would mean you have rivers flowing from lower areas, to the rough patches, and back to lower areas. Obviously that's not going to work. Maybe I am just confused on what's high and what's low, entirely ossible; if so, a legend would be nice (what ARE those rough patches?) and maybe some better contrast for the colors representing heights. (of course, since I am color blind, this might just be me, so do take that with a grain of salt please.)