She's Ready to FiGHT

This is my first ever attempt at lighting majorly affecting the shading(????) of a character and I was dying the entire time. I almost did the shading in reverse but I fixed everything before if was too late.
Y'know I figured out that on average it takes me about two days to start and finish a piece of digital art.

I'm welcome to any advice on how to improve my skills when it come to major shading like this.

P.S. I am aware of the perspective error on Weiss's upper body, I just didn't feel like fixing it