Hey, great work so far! Let me share some ideas with you, you are free to ignore them, but i think there is a room for improvement.
- I think the ambient, front light is too bright, the character would look better if illuminated only or mostly by the thunders from the sides.
- The background spike-like element is distracting a bit, I believe the simple starry night background would be enough.
- As an air hero, she should be flying in the ari, not walking on the ground 
Whatever you choose could be perfect.
But don't go with something to hard/long to detail (like skeletons for instance - but in a way if you choose to explode some bones...maybe it could be easier ?).
Agreed with what @rgdraw and partially with @MarcinKulesza said.
@rgdraw Thanks for the confidence. I tried some big ugly monsters, but they seemed to take up too much space and made everything a bit crowded, so humanoid it is! 
@MarcinKulesza originally the front lighting was weaker, but I didn't like how the skin looked with only the lights from the side, so I decided to lighten the whole character.
After I add the dead bodies in the background I'll take out the Structure to see how it looks.
@mr_dessin I didn't go with skeletons, but probably something just as terrible. There's several charred crispy human bodies. 
I'll try to have a wip up before I go to bed tonight.
Oh! Wow! Glad you didn't listen to me it looks so cool this way! Great work!
(Did you draw them all or do you have a 3D program that helps make this faster? o: If so I'm curious because that would help me a lot)
Your character design is beautiful! I especially like usage of two lightnings. Great idea!
I love how clean this is. Are you going to do anything else with the cloudy/space area in the background? I don't think it needs more contrast but you could add a couple of specific cloud shapes that compliment the composition. Even if you don't it already looks nice and polished. nice work
@rgdraw Thanks! I've used ZBrush in the past for that, but this time I just had a friend come over and I took a bunch of photos of him with my phone and used them as reference.
@danrob Thanks! I'm going to see if I can get some smoke rising off the corpses. If its too much though I'll probably just keep it the way it is.
Damn that's badass! Your anatomy accuracy is impressive!
Last update for the day. Let me know how the smoke looks. I'm not sure how much I like it.
To me the smoke isn't really that noticeable, and while the corpses look amazingly rendered they don't look like they were charred, maybe if they were redder and bloodier. Looking at lightning victims (mostly animals of course) the char is usually red in base colour and not a grey, they look a bit more like they were frozen!
But yeah, I'd make the smoke a bit more noticeable at least
Lovely work, one of my favs. on the contest!
Alright! I think I'm willing to call this finished!!!! 
I still reserve the right to make a few adjustments here and there before the deadline, so I'd still like to hear any feedback.
I'd like to say a great big thank you to everyone who helped along the way. There were a few times where I was getting pretty frustrated with how things were turning out, so all the comments were tremendously encouraging. The Cubebrush community is a great place for sure! 
Agreed with all what you said here !!!
Sometimes you really want to flip the table (especailly when you see other works T-T , yours included)...and say heck, start everything from scratch again, and again, and again 
Of course this is not necessarly the best choice.
Everything look so good in your piece 
All the best of luck !!!
ps : also, I'm not sure if you think of it, but that would be a nice add to see some very little bolt of lightnings coming along some bodies here and there...but maybe that's too much ? don't know.
Because I'm stupid I decided to do a concept sheet as well. 
fantastic finish