Nice exercise in lighting but subject is a bit too pristine for my liking; perhaps a sprinkling of dirt would add to the composition.
It's always fun to shoot globes, be they marbles, balls or whatever. Billiard balls on a green felt table are always a good subject as are marbles in the way you shot this. Playing with the light or lights and backgrounds can do marvelous things to the subject...
Very nice image, well taken. Will you be taking up marbles now, Brian.