The trees could use a little variation for sure.

For the rest: a wonderful stylish map, good choice of brushes for the most part and a very nice colour scheme.

There are just two things that you might want to consider changing.
First, the brushes you used for the castles / settlements do not really fit with the rest of the symbols. You could try changing them to something simpler, two-dimensional, with strong lines.
Second, change the text. The white colour does not fit in this map at all.