"Junge Frau", Johann Friedrich Dryander, between 1780 and 1795
Portrait of a young woman, presumably princess louise of hesse-darmstadt (1761-1829)
identification proposed by user ecummenic (talk) based on the comparison with a portrait of that princess (see image below). Date: between 1780 and 1795. Medium: pastel. Collection: Unidentified location. Johann Friedrich Dryander - Junge Frau