Hmm, have you tried this thread about rivers? -> How to get your rivers in the right place

Good job on those mountains, but special point to the mountain+forest placing, it really gives the map a amazing look so far. Although I think the map border/frame shouldn't cross over each other like its happening on your map (at the corners), maybe you could try some "changing direction" area from the verticals to the horizontals. I hope you can understand what I mean, I didn't know how to explain that well .