Great that you really got to the nub of the challenge. so few people make it that far :) I don't think it matters that you've shot negative fiklm ratehr than transpaerency
I didn't really like the negative or slide shots in this challenge. They lack something which pulls the picture together and makes them look more than thrown together. This one isn't an exception.
i like this as a transparency photo, because the light allows the viewer to really experience these strips as transparent film as opposed to objects in the photo.