I love the feel of this map. Very atmospheric. Screams fantasy-novel map or p&p rpg map to me...which is a good thing in my book Very much looking forward to where you are going with it. Will you do forests as well? I hope so.
And, in my humble opinion, not everything has to "even out" ... so don't do ridges just because there are some in the bottom of the map...do them if you think that that's how the world looks like (geographically sound arguments are not absolutely necessary but it's awesome if they are...at least imo) or if it is necessary for the story you want to tell etc. etc. .

Anyway, really nice map, have some Rep. !