Lucretia Sir Godfrey Kneller (1646-1723)

The picture has something of this: people, portrait, woman, wear, man, knife, two, son, nude, music, girl, tattoo, museum, festival, theatre, model.
Perhaps it’s a painting of a woman in a brown dress holding a knife in her right hand and looking up at something in her left hand, with a red curtain in the background.