I like the levitating shots I've seen. This is a bit too saturated which makes the model's hands look blurred (could be some mild motion blur if it's a long exp too since it would be hard to hold them still). I might have cloned out the zipper lines. 5
The focus is off... like you almost tried this without a tripod.
Some suggestions...
Drape her in all black, there fore making it look even more mysterious that her hands and her head are the only things present with the floating heart.