Melancholy of the White Lily is the thirty-third chapter of the Oushitsu Kyoushi Heine manga.
Leonhard refuses to get his portrait painted by the court painter because he doesn't want to stand still. The court painter, Niche, wants to paint him because he's known as the most beautiful prince on the continent, which is something that Heine completely forgot about. Heine manages to shame him into agreeing to stand still for his portrait, but Leonhard finds it too hard and ends up bursting into tears from an itch. The painter liked his expression so much it ended up in the portrait.