"Portrait of an Aristocratic Young Man, possibly of one of Maria Theresa‘s sons", Martin van Meytens
Portrait of a young nobleman thought to be of one of maria theresa‘s sons, but is probably a depiction of a son of charles vii, holy roman emperor
identification proposed by user ecummenic (talk) based on the comparison with a portrait of those princes (see image below). Date: 18th century. Dimensions: height: 95 cm (37.4 in); width: 70 cm (27.5 in). Medium: oil on canvas. Collection: Unidentified location. School of Martin van Meytens - Portrait eines adeligen Jünglings