I have come across some pictures by a French artist called Honore Daumier. The pictures are of third class travel on a train. They're from the 1850s.
It strikes me that these pictures are of real people. And also, that it does not matter who these people are. It's probably accurate. It's certainly not intrusive. (I am still bothered about this privacy issue!)
What's important, surely, is the story behind the pictures. And the humour and insightful relationships between the people.