I think the mountains look great. I'm torn about the 'busyness' issue. I like all the place names, it really adds depth and history to the map, but it can start to overwhelm things if you're not careful. Right now I think you've got a good balance. One thing you might try is adding a fairly low-key dark stroke to your shorelines, to help them stand out just a touch more underneath the text. Looking awesome all in all though!