What is the author's style in Mirror Mirror by Gregory Maguire?

The majority of Mirror Mirror is told from the point of view of an omniscient narrator, which is common in fairytales. There are several parts of the novel which are narrated by characters within the story. The novel's opening and closing sections, "The Roofs of Montefiore" and "Montefiore" are both narrated by Bianca de Nevada, the main protagonist. In addition, Bianca narrates the section entitled "What I Saw Then."