I'm gonna give a bit of a shorter review here.

Starting with the arrows: These are good, but you can really try to make them get much more smaller while they go back in space.

Branches: These look really good.

Plant Construction: They are fine in general however, I notice 6 out of 8 are the demos. As comfy said, including demos is fine but it should be less than half of the total number of of constructions (3 max.) I would like you to do more non demo plants.