Here is a list of the paintings seen in the Uffizi Gallery in Episode 7.

06:37 Madonna and Child with Angels, 1457-1465, Filippo Lippi
07:13 The Annunciation, 1489, Sandro "Filipepi" Botticelli
07:19,10:30 Allegory of Spring, 1481 circa, Sandro "Filipepi" Botticelli
07:40 Portinari Triptych, 1476-79, Hugo van der Goes
07:57 The Birth of Venus, 1485, Sandro "Filipepi" Botticelli
08:34 Portrait of a Man with the Medal of Cosimo the Elder, 1470-75 circa, Sandro "Filipepi" Botticelli(left)
08:34 Adoration of the Magi, 1476 circa, Sandro "Filipepi" Botticelli(right)
09:02 Madonna of the Pomegranate, 1487, Sandro "Filipepi" Botticelli
Note: A pomegrante is known as the Food of the Dead in Greek Mythology.

The story of Demeter and Persephone: Hades kidnaps Persephone; Demeter gets sad(she's Persephone's mother and the goddess of the harvest), so the world falls into ruin (winter). Zeus, he gets Persephone, but because she ate 4 pomegranate seeds, she has to go back to Hades for 4 months out of the year. (For a more detailed account, see this page)

Hugo van der Goes And Sandro, those paintings are in Room 10/14 of the Uffizi Gallery (for a map, see this page)