Louisa Lane, Called ’Cecilia’ John Hoppner (1758-1810)

The picture has something of this: lid, people, portrait, wear, child, veil, woman, costume, bonnet, winter, dress, girl, outerwear, cap, retro, jacket.
Perhaps it’s a painting of a young girl wearing a black dress and a yellow hat with a white ruffle on top of her head and a blue background.