Well done on going out and getting real people, Chris, not just once but four times
They all work well as individual images and as a set; I just wonder if the set might look even better without #2 as that one seems to be slightly less contrasty and the people aren't quite so prominent. It could be because it's the only one with the sky in the frame that makes it appear the odd one out to me, and that's just my humble opinion, not a criticism as I think they do complement each other very well. Excellent idea, and great that you're using film too