2nd reference should have been:
Your introductory paragraphy should cover the main approach you are taking to the work or the main theme on which you will focus and then point forward to what you will cover in the rest of the essay.
Starting with a discussion of the Pieta as a genre, and how Michelangelo’s work was both similar to and different from that of his immediate predecessors and contemporaries might be a good idea.
You might also give a bit of the religious background to the sculpture, and talk about the position of the Virgin Mary in Roman Catholicism, and how emphasis on her focuses attention on the human nature of Jesus.
^^^ Thank you! I was going to take that route.