Thanks, but what if the lightsource is in the middle left? The lightning is supposed to be just a background. I can see why you are confused though, maybe I figure out something else for that.
I`ve done a quick and dirty editing to show you how I think it should look. The lightning is in the background and is not illuminating the charakter. It only does from behind. The light edge I drew on the charakter should not be as bright as in my sample because the lightsource (the lightning) should be brighter than it`s reflection. Hope I could help! dl.dropboxusercontent.com/u/1464799/lk5vnbtz.png
Any tips? That was definetely the hardest part no doubt. I'd like to know what exactly is wrong with it.
The lightning looks gorgeous but the girl really ruins it. Not too much her design but her shading.
With lightning as main light source, it seems pretty good to me.
I like your style.