I actually couldn't tell there were any forests on the map, until I read the text. I think the color for the forest is good, and wouldn't change that. I would add some texture to the forest. When you have mountains that look that textured and strong, you expect to see forests to match the style.
I think I great way to improve the forests is just to add some depth to them. It could be slight. Just add some sort of tree top feel to the area. Or consider darkening the green to create an edge.
I would just take some time digging around the Regional/World Mapping section of the forum and getting some inspiration/ideas.

Hope that helps

Cheers!
Capt.JH