What Gidde was referring to was the mtns have shading on the right side so maybe put some green shading or just a big blob of green under the trees to help designate it forest instead of just the tiny shapes. Personally, I think the brown line forests from post #4 look just fine. The only thing to look out for is the weight of the line...the forests are drawn with a thinner line than the mtn shapes. You might want to try making the forest lines thicker to match the mtns so that it looks like the whole thing was drawn with one pen tip or maybe just do so with a tree here a tree there etc but not all of them. The thick and thin lines will give the forest even more character than they have now and the thick parts will help give them more weight and attract the eye.. The easiest thing to do would be to make the mtn lines thinner.