There is a couple of mountain brushes if you search on deviant art or here in the guild. Ramah and Schwarzkreuz among other, did some nice brushes. That is good if you want to add symbols but since you map is already folded you could increase it's intensity where the mountains are. Maybe it would fit better.

A question though, in wich direction does the water flow at Gibraltar? The topography suggest that it flows inland but it might be otherwise. Right now it might be a little confusing, so have you tought of a way to indicate in wich direction the water flow? It might be useful sinci it seems to play an important part in the world.