ALl the photos except #5 don't have an interesting composition as far as I'm concerned, so it's hard to offer much more than that for those since that's so important to the photo.
As for #5, the BG isn't very interesting, but the "people" are so I would have selected a wider aperture to isolate them a bit more from the BG. Maybe try a front angle with that same general framing of them as well.
Also, go back and shoot the sun setting inside one of them to get a nice starburst effect spreading across. I think that would be cool.