What is the author's tone in Eleven Minutes by Paulo Coelho?

The author uses different tones to represent the differences in Maria's public and private lives. For example, Maria's attitude and tone are brutally direct when she has her first encounter with a man of the world, the Arab who pays Maria for sex. Maria wants the world to see her as sophisticated and worldly and adopts a tone of assertiveness in an attempt to disguise her internal fears. However, Maria is a different person when she writes in her diary, where her words are genuine and come from her heart in tender, romantic language.