This altarpiece has three vertical sections. The central one features Our Lady seated, with two angels with the traditional Calvary which crowns the composition, while the side sections narrate six episodes from the life of Mary.
Of these the first composition, located to the left of the observer, is the announcement of the archangel Gabriel to Mary, and the next, in the right-hand section, depicts Mary's visit to her cousin Elizabeth. In the second section, in which the order of reading is reversed, we contemplate the Birth on one side and the Epiphany on the other.
Finally, the last section narrates the Flight to Egypt and the presentation of Jesus at the temple.