Feudal Japan: The Shogunate - Ninja - Artstation's challenge

One of my characters design for the artstation's challenge the Feudal Japan: The Shogunate. Ninja - Shinobi - Kunoichi
In my design I chose yokais for each of my characters. Pairing (external features) with yokais: Hinode - Kamaitachi and Kasha. I like the female ninja idea (too cool to miss it) so I started to work in this direction.
You find my whole entry here: https://www.artstation.com/contests/feudal-japan/challenges/55/submissions/36048