Cast:
The teenaged girls are more wild and alive, whereas the other characters/adults are more reserved and grey.
Possible candidates
Mia Wasikowska - Pauline
Director:
Guilermo del Toro
Style:
The overall feel of the film is to be split between two extremes. Scenes set in the real world (the school, the two houses of the girls, etc) are to be dull, with a lot of desaturated blues and greens as their primary palate. Whereas the scenes in the Fourth World and shots in the real world tinged with their madness are to be bright, colorful, and exaggerated. Something along the lines of Moulon Rouge, or Across the Universe in how the first half is desaturated, and the second half wild and vivid.
Music:
Scores will be few and far between, much of the film will be only dialogue and local sounds. The scenes that are set in the Fourth World will have subtle sweeping symphonic pieces, think The Lion the Witch and the Wardrobe. Additionally scenes with Mario Lanza's music will obviously be scored with such.
Cinematography:
Shots in the real world will try to either give a sense of claustrophobia or emptiness, with the feeling of the respective families pressing in on the girls, or when the are being separated towards the end of the movie, having the shots make the rooms they are brooding in feel large and empty. The Fourth World should have more sweeping angles and wide shots to show the beauty of their created world. The scenes of madness should be playful with quick cuts, a sense of childishness tinged with a manic air.
Costumes:
As with the rest of the film, the costumes are drab and rough, the school uniforms should seem oppressive and stiff, while their regular clothes are equally dull. When in the Fourth World their clothes should be the same style and appearance, but they should be colorful and seem comfortable and almost luxurious.