Wow - tons of awesome details and so many unique textures! You are quite talented. So clean and crisp. Love the background - it's minor, but it really adds a lot. (I struggle a lot with backgrounds, so this is a cool way to see it done. Simple and effective.) Fantastic job!
I am in shock in awe! Looked up the WIP from the link and back, realizing myself about drawing a human face to be as detailed to the core. This is something I must practice to draw a real looking face. Be it a real person, or semi-realism. Excellent drawing.