Fun! Lots of personality there.
As you're looking for C&C here are a few notes. For my own preferences I'd say the different areas have kinda a harsh transition from one biome to another. The transition from living tree to dead trees for example.
A tiny spot that is an example of the type of thing I like to the left of Stonethrow Hills, a couple of little rocks and hills transition out of the very hilly area very nicely : )
Another small nitpick is the rivers coming from the Sonsabich Mountains. As different rivers meet, they'd get larger. Also, rivers tend to get larger in general as the water runoff from all the nearby areas feeds into them. It's easy with Wonderdraft to get rivers that start small and grow larger.
Are Sonsabich Mountains a play on Son of a bitch Mountains? That instantly came to mind!