From the lost gallery's photostream on flickr fixed upper left corner.
The high waistline places this portrait to around 1820. Catherine's dress has a simple design - in satin and fur.
Keywords: Catherine Pavlovna, Königin von Württemberg, Queen of Württemberg, Grand Princess, Queen, Romanov family, Württemberg family, curly coiffure, curly bun, bateau neckline, fur trim, quarter length close sleeves, waist band, Empire waistline, close skirt