What a good idea for the challenge. I would like to see how you did the lighting. The picture looks a bit tilted even though I don't think it is as the table edge on the bottom is straight. Perhaps if you had rotated it a bit to the right and then cropped so the table edge wasn't visible it wouldn't look slightly out of kilter. The reflection is nice. The picture is a bit noisy, thing some noise reduction might have really make it stunning.
I would have liked to have seen the objects a little larger in the frame. Maybe you were worried about cutting off the reflection? I wonder what this shot would have been like if taken vertically. I don't really mind that it isn't sharp as a tack, but I think in this case it might have added to the shot.
too much negative space.... I don't feel like its adding anything to this image... the interest is in the color and shape rather than the emptiness....