Well, after all, there ARE 5 photos to be seen. So why not count to 5? It's just that your shooting buddy "is no number"... erm.
I like 3 best. I just love repetitions as a compositional element, and we got that here. One thing I'm wondering about in 3 is whether we do see real persons (and not only headless mannequins), or if we don't. At this size, IF there are some persons there "hiding in the shadows", they are doing so quite successfully.