I'd select the image, invert the selection, add some feathering then I would paint the background black (#000000). Putting a new white layer just under this 'black" one to see places you miss helps alot. Using the burn tool IMHO doesn't work very well to get a background black.
The reflections are interesting, but your exposure is just off bit causing hot spots.
If you are using the camera's meter, or any reflective light meter, you must remember that they will always try to expose for Zone 5 or neutral gray. Hence the black background becomes gray. You need to use some kind of incident meter to get an accurate measurement. If you don't have one get a hold of a Zone 5 card and place it in your scene to meter off. If you are good at reading the histogram (I'm not) you could shot a frame, chimp it, shot another etc until you get a good one, with digital this isn't such a big deal. Along the same lines, having the correct white balance can make a big difference in how your image will come out.
Jack
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