From bbc.co.
This is presumably derived from the portrait seen in the last image.
Keywords: Pourbus the Younger, Infanta Isabel Clara Eugenia, Princess, Spanish, Habsburg family, straight coiffure, high enclosing neckline, neck ruff, lace, jeweled headdress, framing headdress, draped necklace, earrings, jeweled crucifix, cuffs, tabbed sleeves