That was good of you to look for examples. But I wonder how many paintings that we can find with Google searches are based on photographs. I've encountered visu

That was good of you to look for examples. But I wonder how many paintings that we can find with Google searches are based on photographs. I've encountered visual artists who can usually tell the difference between a drawing done from life and a drawing done from a photograph (my eye is not that subtle), so I think there are quite a few people who draw by looking at photographs. A study of the issue described in the article would probably want to look at visual art from a time before photography, and there is plenty of that in the world.