Infected - Villains

I decided to play a little with characterization and stylization using the villains of my story Infected.
I'm also trying to make some reference sheets so that I can have all me characters ready for a future project.
I'm not statisified yet with how the colors are turning out but I have 15 more chatacers to go so I'll have the occasion to change it if I feel like it.
The facial expressions should help to understand the character's personality :)