“This painting may depict the moment when Jupiter approaches the chaste nymph Callisto disguised as Diana in order to gain her trust. Juno, the jealous wife of Jupiter, changed Callisto into a bear and she was nearly killed by her own son Arcas, when he was out hunting.”
“Nine months later Callisto’s pregnancy was discovered when she was forced by her suspicious companions to strip and bathe after hunting. Titian chose to paint the moment of her humiliating exposure and banishment from Diana’s chaste entourage.”
The quotes on this page are from the descriptions of those two paintings by the National Gallery.