"The Young Tennis Player" (also known as "Eighteen Summers")

Framed oil on canvas portrait painting of a girl kneeling in grass with a racquet in her hand. She is wearing a blue, brown, white, orange and tan short-sleeved dress, a wide-brimmed hat, and a wrist watch on her left arm. Two boys in white shirts and dark shorts are in the background.

An artist known primarily for his paintings of nudes, Sieffert was also a talented portraitist who worked in both his native France and in Germany.