"Guardian of Chaos" - critique/need help

[Fesbra]

Hey guys
First post in this and is for a critique. way to go.
Anyway.
I have trouble with this illustration. It needs lots of finishng (detail on the floor, detail on the background, maybe some mist in the front or some other thing)

But what I ask is in matter of CONCEPT and COMPOSITION.

I have a really strange feeling with some areas that are not really well done. Like...empty.
I feel i have to put way more substance and complexity into the image.
I'm not really convinced with the little "chicken bones" hanging from the head branches. maybe put something more significant... like... dunno.

lend me a hand over here.
Cheers
and thanks for the opinions and observations in advance.