The color scheme you picked works pretty fine. The main issues on this map is the sharpness elements consistency imho : Al lot of trees (especially the round ones) looks too sharp comparing to others and to the mountains. you probably size up or dow some brushes, which make some blurry while the others keep their sharp origial resolution. I would suggest to re-work the forests without scaling brushes. The coastals cliffs look a bit blurry too, I would try to sharpen them a bit to match the other elements. Also since your made your rivers blue, I would also make the sea blue (or at least make a blue waterline ring) to match it.