Yes I know another tree design. Tell me what I could do to make it better.

Too symetrical - that's not a bad thing, I just prefer more obvious asymmetry. This doesn't really convey the title too well as apart from the red, neither side is really clearly passive or aggressive. Also note that the red seems to be forward of the blue (due to an optical effect), and that red is not a universal symbol for aggression as for some cultures it has different meanings. The snakes could be better integrated by having them work with the circles better - rather than just sitting them inside they could coil around their circle or something. Having said all that I DO like the strength and some elements of this design.

looks like a mapping of the lymphatic system

It's a nice idea, but make the snakes more obvious. I didn't see them until I saw the zoom.

make the trees differant from each and change the colors of the balls.

to what colors

i don;t like that black vagina looking thing between the blue and red circles and it would look best on grey