Gorgeous colour-job Max! That is looking soooo beautiful!
I do agree with Lingon about the highlights, though. But to me it's more the colour of them that looks a bit wrong, rather than the actual brightness. They seem to be too similar in colour to the ground the forest is on, like perhaps you've shaded the trees but left out random sections, so the actual ground/colour is still showing through? Maybe you could try colouring in those "highlights" with a pale green (rather than that pale brown/beige), or just darken them up entirely using the same colours you've used for the rest of the forest shading.
EDIT: Looking at it again, it seems like those highlights are greenish rather than brown (it's kind of hard for me to tell - must be my eyes!). So I guess I'd suggest just darkening them up a bit, so there's more contrast between the forests and the terrain.