I think your mountains are too realistic for a greyscale and handdrawn map. These are mountains I would expect in a sattelite image. Also, the style doesn't mix with the forests. They do have more of a handdrawn feel.
Still, I don't really like the forests either. They have some 3D thing going on, except near the coast... then they are flat (check out the small northeastern island for example).
At the moment you created a bit of a Frankenstein I think... this is the way to learn new stuff of course and I applaud you for experimenting.
I do like the landmasses and how they look.