First of all, I would love to say that I love your style. As soon as I see a piece of yours in my inbox, I know who the artist is before I even look at the name. I always save your work for last because I know I'll be in for a treat! ;D
Now, to be more "serious"- I applaud you on the fabulous job of balancing out Benedict's lovely features with the gorgeous decaying of his skin. One can still see the vestiges of his distinctive Cupid's Bow lip, the nose, and of course his renowned cheekbones.
While there have been a few versions of zombie/undead Sherlock/Benedict (including a previous one I have critiqued), this still feels very different from the others.
Because where others have depicted him as thoroughly gone (mentally), you have left him looking very much alive. You have used an overall very warm and rich colour scheme as opposed to other pieces I have seen, which primarily use blues and purples. In addition, while the skin is obviously decaying (which is very well-done, might I add) and the white collar a bit bloodied, his hair and skin look remarkably clean, and his clothes are neat and un-rumpled for the most part.
However, my favourite part (other than the lovely rotting skin) and what truly sets this piece apart from others I've seen of this genre (for lack of a better word) is his eyes. They are so keenly observant and intensely alert that you immediately know that his mind is not gone like every other zombie mindlessly roaming around. However, looking at him for a while, you notice that his gaze isn't as strong as you first imagine it to be- perhaps his mind is slowly deteriorating. Perhaps he is merely in his mind palace. Whatever the case may be, their iciness sets them apart from the rest of the piece, draws you in, and keeps you gazing back at him for longer than you realize.
"Delicacy" is, in short, a masterpiece. To those of you who have not seen this artist's gallery, go do so! 'Tis full of even more quality work! Go now!