Narcissus by Michelangelo Merisi da Caravaggio. This is another painting of Narcissus, and I think it is a very powerful one. The painting is very dramatic, and portrays Narcissus in a darker light. There are no etherial elements in this painting that would lighten the image up. It is very dark, and portrays his narcissism as more of a bad thing.
Sacred Love Versus Profane Love (1602–03) by Giovanni Baglione. Intended as an attack on his hated enemy, the artist Caravaggio, it shows a boy (hinting at Caravaggio's homosexuality) on one side, a devil with Caravaggio's face on the other, and between an angel representing pure, meaning non-erotic, love.