If you name your readme file "ReadMe," or "License," or some other generic term, its going to get overwritten by the next guy's generically named file.
Same goes for your model names and texture names.
If you name a texture "Leaf01" I have no idea what plant it goes to. I'm about to delete a ton of plants simply because I don't have time to sort and rename them. It will be less trouble for me to model them myself or buy from someone else. Also, an object named "Plant" or "Plant_01" is useless. They get overwritten and your hard work vanishes. So please name your oak tree, OakTree at least, and call the bark texture OakTree_Bark_tex or something useful.
Additionally, I've looked at some of the plant models and they are astoundingly overcomplicated -- 15,000 polys for a flower for example, when fewer than half that would do the same job in the most closeup render possible, and fewer than 1000 would do for most cases, not to mention the unnecessary triangular faces on all of them. You make them like that, I can't use them. Its poor modeling and wastes resources.
p.s. If you're producing your models then converting them into Terragen's opaque .tgo format, please please please list the specs and provide a wireframe. I want to know what's under the hood and with the tgo I can't see any of that.