(1) COMPOSITION (CONTENT) Well composed. The diagonal lines of the tacks really draw the eye into the frame. This along with the strong use of rule of thirds makes a very powerful composition. The lighting is also a very strong point here, the colors of the tacks against such a rich dark background really works.
(2) BACKGROUND I really like the darkness of the background. That really makes the tacks in the foreground really "pop".
(3) CAMERA WORK ,TECHNICAL Exposure is good. Composition is very strong.
(4) DIGITAL PROCESSING ,TECHNICAL There is only one change that I might suggest. The DOF you have used makes some of the tacks in the back a little soft. I am not sure if it would change for the better or worse to have them sharp. Might be worth an experiment.
(5)MEETING THE CHALLENGE This photo does a very good job of meeting the challenge.
(6) MY OPINION ON THE PHOTO A very strong photo and i see that the voters agreed. Nice finish for a very humorous and well done photograph.
I love the story told by your photo. The gold tacks are so effectively highlighted and reflected and the black all around makes for a very strong contrast. 10