This set of photos would be closeups of different people's necks, specifically via the pose in my example photo. It's not a pose people strike a lot. If it would help, the background and lighting could be consistent, but it might be fun to vary them. I'm not sure.
Personally, though it's not a huge deal, I get a little self-conscious about my neck when I think I did a bad job shaving. Lots of little hairs left over. I've heard the best way to accept a part of yourself is to study it, and even better to see it reflected on others. Since the neck is such a vulnerable part of the body and this specific angle is so rare, I think it would be really interesting to compare different people through this different perspective.