I wouldn't so much say strong reactions, I kind of like the direction you're heading though

I might suggest toning the bevel on the shoreline a bit, it looks like you're using solid black and white for the highlight/shadows, perhaps shading a bit closer to the land colours (light brown/dark brown for example). As it is the shorelines look very cliff-like at all points (to me).

the rivers look fine, i don't see any issues there.

I like the forests, and the hills are very hill-like, I especially love the effect on the southeastern island
Not so sure about the mountains, they seem to be very close to the hills at this point in effect. They look great in the thumbnail, but closer up they don't seem as defined.

Good start though! looking forward to seeing the next version