Santa Rufina for £8.4m

Diego Vélazquez’s Saint Rufina fetched £8,420,000 ($17m) at a Sotheby’s London auction on Wednesday, the highest price ever paid for a Spanish Old Master painting at auction. Murillo also painted Saint Rufina. For comparison, I've put Vélazquez’s sulky Spanish child next to Murillo's sophisticated European lady. Will the real Saint Rufina please stand up?