Unknown in a white dress 

This portrait, likely completed sometime between 1810 and 1856, is the work of Charles de Steuben, a renowned American portrait painter. The sitter, adorned in a flowing white dress with delicate lace, is portrayed against a rich red background. The artist skillfully captures the subject's gentle demeanor and refined elegance through subtle details, such as the delicate jewelry and the intricate lacework, emphasizing the popularity of such adornments in the 19th century. De Steuben's works are known for their meticulous attention to detail and their romantic and idealized portrayal of his subjects.