I'm already sorry about that critique but...If I 'm correct G.A.I.A is fighting against all the beast and creatures at once right ?
So why are they (some) looking on other directions ?
A simple correction would be to add some infantry, tanks or whatever by your machine side (on right sure). Even few ones...
Don't take that critique into account if you think this is a bad one...Plus reading some of your backstory I think this is making a total good sense that G.A.I.A is alone.
I feel already so ashamed to post that, because I really like this artwork (and everything you did honestly - where is the movie ? ).
And well if you feel the need to critique my piece one day or another do as you please. Constructive criticism is what pushing every artist beyond their own limits I guess ?
Best of luck !