Looks great. If you want to put in some forests the first thing you will have to do is make the whole thing lighter so that forests will stand out. Put a new layer on top of the stack, fill it with white, set the blend mode to soft light, then lower the opacity to 50% (for now). On a new layer, use a spatter brush to brush in forests, apply your favorite layer styles (color, pattern, bevel, glow, etc).