Focus on this artwork and explain the Iconography.
The work is rich in symbolism and iconographic elements, to an extent far more pronounced than that in The Madonna Standing. An iris grows to the side of the aedicula, representing the Virgin's sorrow at the Passion, and on the other side a columbine, recalling the Sorrows of the Virgin. This symbolic use of flowers is again a van Eyckian motif. While they may appear incongruous with the architectural setting, this was probably the effect that van der Weyden was seeking.
The lintel contains six reliefs from the New Testament of scenes from the Life of the Virgin. The first four, the Annunciation, Visitation, Nativity and Adoration of the Magi, are associated with motherhood and infancy. They are followed by the Resurrection and Pentecost. Above them, surmounting a "cross flower", is the Coronation of the Virgin. The jambs on either side of the Virgin are adorned with statues, most likely of Old Testament prophets. Of these only David, second to the left, has been identified. The bearded man to David's left is probably Moses, the man in the cap to the right is most likely the "weeping prophet" Jeremiah. On the opposite side, the outer figures may be Zechariah and Isaiah.In his usage of grisaille, van der Weyden distinguishes between the earthly realm of flesh and blood, and the divine, represented by ancient sculptural figures, who appear frozen in time. Art historian Shirley Blum believes these figures were relegated to the architectural elements so as not to crowd the central devotional image.The arrangement of the sculptural elements may have been influenced by Claus Sluter's Well of Moses (c. 1395–1403), which has a similar alignment. In the Chartreuse de Champmol, the prophets represent the judges of Christ (Secundum legem debet mori, "according to that law he ought to 
die") and are thus tied to the crucifixion. In the van der Weyden they are associated with the Virgin. Although portraying figures in niches has a long tradition in Northern art, rendering the figures as sculpture was unique to the 1430s, and first appears in van Eyck's Ghent Altarpiece.
Well of Moses Zechariah Iconography aedicula Pentecost Passion Annunciation Northern art Jeremiah prophets jamb niche Old Testament "cross flower" Claus Sluter Resurrection Moses relief David lintel columbine Coronation grisaille iris Adoration of the Magi Ghent Altarpiece Chartreuse de Champmol Sorrows of the Virgin Madonna Standing Champmol Isaiah left Nativity The Madonna Standing New Testament Life of the Virgin Coronation of the Virgin Visitation