I also feel the mountains are too heavy... wait, what a ridiculous thing to say...
What I mean is, they make the mountain ranges look as if they were drawn with a very thick line. This steals all the attention from the coast lines, rivers, labels, everything. It makes the whole unbalanced. One possible fix may be to make the oceans dark as well, but I don't know if that would look good. Another solution would be to use a set of mountain brushes that looks lighter; with hatching instead of block of colour for the shadow side, for example. Or you could lower the opacity of your mountain layer, see how that looks.
The rivers and roads look nice, but I only noticed them after looking several times at the map; I do hope you'll find a way to make those mountains less distracting, cause it's a very nice map otherwise.