C&C per req: I don't think in this case that being centered is a bad thing; there are lots of leading lines which take us to the subject, BUT I do think that monochrome is not the best treatment here. To me, this image seems strong, dramatic, moody; all of which are good elements, but when you say 'Valentines' I want to think soft, romantic, colourful, etc. I think this is a good image (although I wish it were opened up a bit more so that the thumbs weren't partly cropped and you could see the chain fold over the hand), but it makes me think of someone looking at a rememberance of someone who has died.
Just my $00.02 worth - your mileage may vary.
~John