Attributed to Pierre Gaubert – Léopold-Clément, Hereditary Prince of Lorraine (Nicolas Ferry Bebe) Château de Versailles

The picture has something of this: people, costume, sword, princess, wear, music, son, dress, child, ballerina, dancer, portrait, Renaissance, bonnet.
Perhaps it’s a painting of a young boy in a black suit and red shoes with a dog on a leash in front of.