Your composition is very good, although there is quite a bit of "noise" in the dark background. Noise Ninja or something to that effect as to software would help in this situation.
My comments are always made from the heart with honesty and the utmost respect for the artist whose work I am commenting on. If I make suggestions, I wish them to only be taken in the sense that I want to be helpful and not harmful in any way. If I praise your work, I mean every word.
Interesting composition, I like the background lights that add some interest in the dark background. At full size it looks like your focus is slightly soft (but maybe that was the effect you were going for). The one bulb that is right of center actually looks like an eye peering out from the ball.
♫ PJ ♫