I also agree with comments above: the outline is currently too dark, but if you take Ascension's suggestion, you should solve that problem as well as improving the scale. The texture is nice, but, like Ascension said, lowering the opacity dramatically would help.

I agree with Soixante about the tree trunks, and the saturation. I would recommend making the forests less saturated, and either a pale green, or a dark coniferous purple-green. But, either way, with a lot more grey.

Another suggestion, which I think enhances forests, is to include individual trees and copses scattered around the forest edges, getting thinner as they go out.

Great job on the mountains. You could make the shadows darker, but I don't think it is absolutely necessary.

THW