Something you often see in vintage snapshots is not just a shadow cast by the photographer, but one in which you can tell they are looking down through the camera rather than holding it to their face. That was, of course, just the way a lot of cameras were configured at the time. It also resulted – however slightly – in a different perspective, with the camera at waist height rather than the height of the subjects’ heads. I think you can see that here. Just another thing that gives these old images a little bit of their charm.
I also love this one, with its partial shadow, where you again can see the arms holding the camera at waist level.