For round 2 we had to dress our character in formal attire. Can you think of a more formal occasion than your coronation? I can't.
Isabella became queen of Castile in december 1474 (aged 23). Her brother, Henry IV, the Impotent, had just died and Isabella was the only legitimate heiress, since "his" daughter (just run a search for Juana, la Beltraneja) was declared an illegitimate child and denied any rights to the throne.
People should research the Trastamaras, the Tudors did nothing compared to the kind of rumors and conspiracies that took place in Spain under their rule.
Anyway, she's dressed in white, the traditional colour for mourning and she's also posing with the Castilian banner, though she's blocking the castle.
The ceremony took place in Segovia. This kind of acts usually took place inside official buildings, mainly cathedrals or any other religious place. Isabella walked all the way to the cathedral and recited her vows in the public square in front of the building. She then took the Castilian banner and, embracing it, made her way in. Needless to say she became a superstar right after that.
Hope I manage to do that well in the competition.