Portrait of Empress Maria Alexandrovna, detail, by Franz Xaver Winterhalter, 1857. https://www.getty.edu/art/collection/artists/724/franz-xaver-winterhalter-german-1805-1873/
Portrait of the sisters Malvina Anny Louise and Hilda Sophie Charlotte Reventlow, detail, by Heinrich August Georg Schiott (1823-1895). https://www.artnet.com/artists/august-heinrich-georg-schiott/past-auction-results
The Louvre Museum, Musee du Louvre, Paris, France, photo by Claude Bencimon via Fivehundredpx. https://www.louvre.fr/en https://500px.com/claude-bencimon