YES YES OMG YES
yes, yes, and yes. i, LOVE it. creepy, detailed, wow. awesome. what you did with the eyes is AMAZING. YOU DID IT, THOSE WRINKLES ARE JUST...YES.
ok ok i'll critique, i just, love it too much.
i'd say the detail is inconsistent, and i think you could have gone darker, upped the contrast a bit. the shading doesn't go dark enough, and it makes the drawing kinda look flat. the highlights are GREAT though, shiny, and the eyebrow is subtle, but perfect because of it.
Also, i would suggest getting rid of his outline. it's clear that you sketched it first, but if you get rid of that dark outline, i think he won't be so separated from the background. excellent choice of colors by the way.
overall, GREAT, I LOVE IT. i'm into contour drawing and it is very clear that you are excellent at that. good experiment :D
you're very good anyway, expect more reviews from me in the future.