I believe he means lower the height of some trees. But as well, possibly change the scale slightly. (Ever been in a forest? No tree is exactly the same height)
As for the Mountain part, loving it, but adding some nice icy rocks and cliffs may add a nice effect. (Not all around the peak, possibly only 1-3 cliffs and a few rocks, we don't need it looking like Stormpeaks, amirite?)