I must admit i love black and white contrast, possibly from all my years of reading manga and other graphic novels, but I also love when some just takes one incredibly strong color and perfectly enhances that contrast.
It's a weird stance to be wielding a knife in, but she's obviously a slasher.
The fully extended arm, and slightly weak stance makes it clear she feels in control.
Sparing with someone like this is hard because it's clear the don't value their life in certain way, or that their training is so robust you can't be sure how fast the can move, respond, or if the are concealing other weapons.
It would be a tough fight, and you want to reduce their mobility and shake them out of form if you can, possibly break the arms as quickly as possible.
What's most interesting is she's a southpaw, or wielding left handed, and not as many people train to fight left handed fighters because they are statistically less common.
Anyways, I think you rendered the character very well.
Thank you for making this.

g r e e n
i luv it

Shego on crack! Nice design. :)

Green good.Me like green.Green very good, at least for me.