Unfortunately, this picture is really too small to allow for proper critique. Can you post a larger version? I am not sure if you did this, or even knew about it, but we do host pictures here at the Guild. To the bottom right of the reply box there are three buttons; click the "Go Advanced" one. This will bring up the window where the tool bar includes a paper clip icon. Clicking THAT brings the upload screen. This way there will be a thumbnail with your post and the full size image is available when someone clicks it. I would like to see this larger.
As for actual comments on the map, the only thing that I notice atm is that the mountain ranges seem too linear and orderly, if that makes sense to you. Try to give some variance to the arrangement, size and shape of them. You can still keep the ranges where they are but have some spurs going off the main line with smaller peaks the further away, possibly ending in foothills.