Scholars have discovered a previously unknown portrait by James McNeill Whistler hidden beneath a painting of a bridge over the River Thames from 1862. The subject is thought to be Whistler’s young mistress and model Jo Hiffernan, who lived with the artist in London for five years. Prior to the discovery, experts believed Whistler created only around six portraits of Hiffernan, including the well-known Symphony in White, No. 1: the White Girl, 1862, at the National Gallery of Art, Washington, DC.
