Jesus crowns his mother Mary as Queen of Heaven

The imagery is from Psalm 45 (44):14-16, "All glorious is the king's daughter as she enters, her raiment threaded with gold; In embroidered apparel she is led to the king. The maids of her train are presented to the king. They are led in with glad and joyous acclaim; they enter the palace of the king."

Mary's Monogram (MA) on a heavenly throne.