French Postcards from the Early 20th

Famous, a cultural meme before we had the word, sexy postcards printed in France (maybe) and sold under the counter in the U.S. Here are some from recent listings of eBay seller  papercharm. Click for larger versions.

The last two or three seem stylistically similar enough that they may be part of a set. Overall, they are mostly intended to present images from famous classical artworks, or at least appear to be so. The third one is not like the others, but then it doesn't actually show that much, either.