Vilhelm Hammershøi (1864-1916) – Artemis Kobenhavn (SMK) National Gallery of Denmark

The picture has something of this: people, man, wear, nude, group, portrait, back, model, shirtless, two, medicine, son, woman, body, group together.
Perhaps it’s a group of three nude women standing next to each other in front of a wall with a painting of a woman in the middle of the picture.