Wonderful work! This looks super realistic. I hope you'll consider submitting it to my group gallery! You're welcome to join or just add some of your works! If you're interested, just search Rate-Me, and add it to the gallery. (:
Great job! The shadows aren't what you might call perfect (they're in the right place, right tone, but check out francoclun and you'll know what I mean), but the anatomy of the face and hand is. I can keep on going about what else is amazing about your drawing, but I see no point in it, because absolutely everything is!
I made a Hugh Laurie portrait myself (more of House M.D.), could you... ehh.. check it out? If you don't have time it's okay
Don't get offfended by that "not perfect", I litterally mean PERFECT when I say perfect. This is really amazing, and I love it, but it's still not perfect, almost nothing is.