Mrs John Clerk Maxwell (neé Frances Cay) and her Son James William Dyce (1806-1864)

The picture has something of this: people, portrait, woman, two, girl, princess, wear, son, love, affection, Renaissance, costume, baby, crown, saint, child.
Perhaps it’s a painting of a woman holding a child in a red dress with a white ruffle on top of her head and a white bonnet on her head.