Holy molly !
I have a sweet spot for black & white, and you sure hit it there.
I love that transparent effect.
You know, that piece kind of reminds me of Yoji Shinkawa, the artist behind Metal Gear Solid. Probably something about the mechanical parts of the face.
I like the way you did the hair, I'll take inspiration from that technique if you don't mind x)
You're pretty good.