Nice ballanced assymetry. very interesting lighting. I'd think the distribution of colours in the marbles could be improved it offeres a chance for some subtle message through selection of marbles in the image. (7)
the OCD in me demands to see another marble on the bottom-right in line with the red/gold from the left.
the rest of me appreciates what you're trying to do, but the voices of control are outweighing the voices of art, so you're getting a 6.