To be honest I don't like it that much on the girl in the picture. Looks like those breasts are planning their escape :D I also think it might look better if it were a little longer, but that might be the angle of the camera.
The necklace looks ridiculously expensive, but I've never really cared for jewelry so I'm probably not the right person to ask.
The dress is cute, I myself have never been a huge fan or satin. But I like the idea of the necklace, just watch out to make sure the necklace doesn't look cheap. The rhinestone on the side might be a little much.