Maybe you should add some others colours ?
I was going to tell you the other day, sorry to be so late ^^'
Even with few tints...Maybe some yellow or another very distinct colour.
Also...if you are on another planet than earth, you could change grass and sky (rocks too maybe) colours as well.
The other problem I have (maybe that's just me ?) but it's not easy to understand what is really her power on the illustration (without explanations)...I guess she is feeding the cristal with robot powers/energy or something ?
Lastly...maybe she is a bit too much in front of us, try to create an angle more interesting (or extend canvas ?) ?
(and I'm already sorry to say all of this...and now I only can see shoes like @brandoncrampton1 said ^^''' maybe these "wings" could be some sort of vaccum for the wrong energy or I don't know ?)
I really hope others will help you...more advices are sure better than just one...(but could also be burdened when there are too much; and going on all different directions ^^').