I'm confident your friend will be very happy, Claudio. Well done!
You mentioned in the other thread that each subject is the size of a marble. Is that really true? Perhaps your marbles are larger than mine.
Did you end up using a milk bottle? What did you use for the tabletop?
I see that you decided upon the macro lens. Shooting at f/16 kept everything nicely in focus.
I also see that you used a Nikon D5100 and flash. The shadows suggest that you fired the flash off-camera. What model flash did you use?