This refers to Tree 8 only:
The scale is off, the attached render has it resized by a factor of 0.2. Leaf translucency should be set, it is zero in the TGO. I upped it to .9 in this render. Is there a way to make selected branches thicker? Of course it depends on the tree species, but I see a rather thick trunk and then relatively thin branches growing out of it. None of the branches seem to branch out further (other than into the twig clusters), can you model something like a split? The center top is a bit leaf-heavy. I do like this model and I am impressed with the rather fine branching and leaf size that matches the tree (often you see leaves larger than what they should be). I can't see many sharp corners, which is good!
This makes me hopeful that Blender could be used as competent (and free!) modeling tool for objects that can be freely shared.
Thanks for taking the effort to create these. I hope there can be more