That centerpiece is amazing! However I think you might have overexposed this one...and the shadow is somewhat distracting. Light from a lower angle would do the trick, especially if it doesn't reflect off the larger ball directly into the camera. Still, this is totally unique!
I agree with you about the lighting. It looks very surreal. I almost didn't believe it was a photograph at first. The colors are all very complementary and the purple glow is amazing.