Focus on this artwork and explain the Subject.
The title of the painting refers to the mythological story of the abduction of Europa by Zeus (Jupiter to the Romans). In the myth, the god assumed the form of a bull and enticed Europa to climb onto his back. Once there, the bull rode into the sea and carried her to Crete, where he revealed his real identity. Europa became the first Queen of Crete, and had three children with Zeus. When Zeus finally departed Crete, he gifted her three parting gifts, a necklace, a javelin, and a bronze guard.
Titian is unequivocal about the fact that this is a scene of rape (abduction): Europa is sprawled helplessly on her back, her clothes in disarray. Furthermore, the position of legs indicates that she is kicking and fighting and attempting to free herself from Zeus. The painting depicts Europa on the back of the bull, just off the shore of her homeland. Her attendants in the foreground are wearing the same pink garment that Europa has in her hands. 
Although the source of Titian's inspiration is thought to have been based on the scene from Book II in Ovid's Metamorphoses, a more direct influence might be a description of a painting of the rape of Europa found in Achilles Tatius's novel, Leucippe and Clitophon. Achilles Tatius's novel was translated into Italian and printed in 1546 in Venice, only a few years before Titian was thought to have painted The Rape of Europa. Achilles Tatius's description of the dolphins, Europa's scarf, a Cupid, Europa's covering, and "her position on the back of the bull—not with a leg on each side but with her feet on the bull’s right side and her left hand on his horn" is echoed in Titian's portrayal of the same scene. Ovid's translation, notes the color of the bull and the postion of her body, on the bull. "His color is like snow and "Muscles bulge around his neck". This is similar to the physical details Titian shows.
Crete Jupiter Ovid Titian Venice Zeus Leucippe and Clitophon Europa Metamorphoses