Lighting: This seems a bit "washed" to me, with most of the light falling on the upper left hand corner. With the light there, it almost seems like there should be a center of focus there too - maybe an individual heart with a cute saying??
Subject: This fits the challenge VERY well. The only downfall to this shot is that it is a photo of something we are all used to seeing on Valentines Day. There may have been a lack of interest during the voting.
Sharpness: A bit too sharp, and the colors are a bit too bright. I think this would have made a great "soft" print.
Overall: I think it's a good shot, and I love how you filled the entire frame. I might go for a more "unique" subject next time and soften your lighting, simply to avoid a snapshot look. Of course, with the time limit, it made it difficult to go "all out"! Take care, and great job!
Challenge met. Nice colorfult shot. I like how you've filled the whole frame with the little candy hearts as if they are going on forever. Nice DOF, too.