nice focus. lighting is ok. perhaps i would have been more drawn in if the lighting was less yellow and more white. Also, the abundance of necklaces feels cluttered for me. I wish you had stuck with one...perhaps just the heart and wrapped it in such a way that really built an interesting composition.
it's nice as a still life, but i can't quite see why it would warrant a thirty second exposure - i think in terms of the challenge that the shot should be obvious. it also appears a little too cluttered and messy; maybe fewer pieces would enhance the overall impact?