oh, this is actually really good. th positioning of the frame is optimal, that pose of the hand is spectacular, and the lighting has the focus right in place.
the thing that irks me, however, is the lips. they look lifeless and without personality. i think maybe pouting them a little more to give the effect of saying "shh" would have made this a spectacular photograph.
This doesn't make me think of silence so much as secrets. . . To me, this photograph conveys a need to keep things hidden. Afterall, the model's eyes (which are metaphorical portals to the soul) are hidden. . . and it's black and white. Nice job with this.