I think that this is a great black and white picture. I like your subject, although I would have liked it better without the hand. Great focus and composition here.
Clever interpretation of the challenge. I like the composition, the texture, the lighting and the b&w treatment. My only suggestion for improvement concerns the lettering -- it appears pixilated (sp?) or oversharpened just around the words.
interesting take. i would have thought to show the hand from the inside placing the sign on the door...but perhaps that's a bit cliche. really like your toning.