I really like the new trees. The only critique I would have about them is that the brush stroke you've used for them is pretty thick, so that when you combine them into forests the forests turn out really dark. If you used a thinner brush stroke for the trees this might help. Course, that would mean going back and redoing a bunch of work. So you have to decide for yourself how cost effective that would be.

Cheers,
-Arsheesh