Alright mate, you already know I'm poking my nose over your shoulder, so....
Values.
I thought you were gonna fix them by now, but seeing how you're getting ready to finish...
This is what your values look right now, and what I see immediately is that there aren't many strong darks and the overall contrast of the image is pretty weak. The light that is coming from the top is fine, but the flames on the bottom are barely visible. After a fairly quick paint-over, I got this:
It's far from perfect, but I think it gets the point across.
I used a top right light source, a bit of ambient (or whatever is called) lightning and of course, the fire on the bottom. The smoke in the bg became very dark, so I tried to break it up in a way that would compliment the character, not compete with her. (that could use some more work, like on the right of her neck). I kicked up the lights of the costume a bit, changed a bit the way the lights went on the hair, they looked very artificial imho (again, that could use some more work). And then some very faint light to transparent gradients on the top right and bottom left.
Here are the two one next to the other:
The focal point is still not too clear, but it's a start.
I hope you get something out of this! ~(^O^)~