Manga illusturations in Because of you PV?

[Happii]

I recently watched Because of you PV and it rocked my world I was absolutely SCHOCKED to see the old-looking shoujo manga illusturations! They look awfully like Riyoko Ikeda's style. She's the author of one of my all time favorite manga series, Rose of Versailles. I couldn't figure out which manga series those illusturations are from and I'm not even sure if they're from a certain series or just illusturations. If you know anything about this please share with me.