"Portrait of a woman in a red dress", François de Troy, circa 1720
Portrait of a lady, presumably anne-louise-julie de crévant d'humières (1665-1748). Identification proposed by user ecummenic (talk) based on the comparison with a portrait of that lady (see image below). Date: circa 1720. Dimensions: height: 41 cm (16.1 in); width: 33.5 cm (13.1 in). Medium: oil on canvas. Collection: Unidentified location. École française, entourage de François de Troy - Portrait de femme à la robe rouge