Pan and Psyche
It is perhaps a wrongheaded approach to evaluating Pre-Raphaelites, but I always seem to judge the artists by how they represent women in their works. Obviously these paintings are for more than just their female characters, but those characters are so representational to me of the romantic concept of England that I cannot divorce myself from this approach. And Burne-Jones was able to translate that sort of beautiful English romanticism into subjects not only Arthurian, but Greco-Roman, more beautifully, I would wager, than most of his contemporaries.
Lancelot at the Chapel of the Holy Grail
The Baleful Head
King Cophetua and the Beggar Maid
The Birth of Pegasus and Chrysaor from the Blood of Medusa
The Wheel of Fortune
The Perseus Series: The Doom Fulfilled