A couple of small things are bothering me.

Yes, as you said the sharpness of the mountians is not constant and that could be improved.
The other thing is the rivers: they are thin near the coasts but large inland. This suggests that the water is flowing away from the ocean.

The forests are fine. Forests could be used to indicate the density of population with unsettled lands covered with trees, or to indicate the climate. At this scale it's rarely precise anyway so it's mostly a matter personal preference.