Meets the challenge however I don't find this all that interesting to be honest. Mind you it's not easy to make something like this interesting so that's why getting creative in your technique is vital. One possible way to do that is to take a less than common angle say much lower so that the pin stacked on top has some height to it vs the flatness it has when shooting above it. Also, I'd move the subject that you have in focus off-center.
I really like the concept, I think it would have worked better on a black background, with some softer lighting. Maybe even kick it up a notch and have them lite up. I know it would be hard but just think how cool it could be!
3 - Looks 'snapshottish' and too haphazard without being intentionally so. Too close and OOF and overall not balanced or enough 'depth'. Perhaps a tweaking in pp may have given this a little extra, not sure.