The screenshot makes me remember how much of a thorn the polygon sizes are in Warband, in case you want to create a bigger map. I've only recently touched a PW map, and I already hate to work with such huge polys. Nevertheless, you handled the mountains well.
I would suggest to use different inclinations and sizes for trees. That will drastically change the look of the map. Personally, I work only with a small array of good-looking trees, like pines, tree_5 or tree_new_3, but I guess that's just a matter of personal taste.
For the future, I can advise you to make the locations as compact as possible. By that, I don't mean to make them small, but to keep a clear delimitation between them, as to prevent the map from becoming a mess.
Good luck.