For the structure, give it a defence mechanism, some sort of organic weapon…
since you got roots going “up” you can also add some sort of plant growing “up” like the plant was growing around it and followed the roots upwards, “do that make sence???”
like “UP” ahhhhh!, I dont know how to explain it :shrug:
Well, great job man! and thanks for the sketches 
- cheers and keep it up (two birds with one stone)

good job…
