The artist is Caravak
Anna Leopoldovna (Ugre. Elena Ekaterina Christina; 1718–1746)-Princess Braunschweig-Luneburg. The niece of Empress Anna Ioannovna and her daughter Sisters of Ekaterina Ioannovna and Duke Karl Leopold Meklenburgsky. Since 1739 – Anna Leopoldovna, the wife of Prince Anton Ulrich Braunschweig, in 1740–1741 a regent with a young son – Emperor John Antonovich (Ivan VI), granddaughter of Ivan VI. He died in exile in Kholmogory of the Arkhangelsk province. He was buried in the Annunciation Church of the Alexander Nevsky Lavra in St. Petersburg.