Willy-nilly means randomly placed and scattered. While coastal mountains are possible, especially in fjords, there are just a whole bunch here. Sure they look fantastic from an aesthetic point of view and make for great paintings they don't happen all that often. I'm not saying to put your mountains smack in the middle of the continent either, that doesn't happen either. What I am saying is to push them back from the coasts a bit, few hundred miles. Leave a few, for sure, this is fantasy after all, but push most of them back. Wormy said everything else pretty well.