Right here's my take on the shot:
You were going for a juxtaposition of two very different things: the softness and, for want of a better expression, loveliness of the curvature of a nice bosom. This is to be counterpointed by the spikeyness of the bondage belt - soft rounded flesh, vs bright shiny spiky nastiness. Am I close?
If that's the look you were going for, then it's got to be a clean shot. You need something brighter and more focussed than a desk lamp really, maybe a 100W reflector bulb in a lamp would work. You also need to get rid of distractions like the sheet? and the arm.
I really like the shots you post as I can see what you're going for (I hope!?!) and they're really strong ideas. However, a little bit of work on the lighting and a bit tighter composition and you'll be right there.
Rob