Jane tends to feel more at home outside than inside because the natural world has provided her with more of a refuge than any human habitation.
Jane conceives of "home" as an emotional place created by interpersonal relationships, not as a physical shelter.
Jane's characterization in terms of elfin or fairy-like qualities creates a dark, eerie undertone to her usually staid and proper exterior.
Jane Eyre uses supernatural imagery, but not actual supernatural elements, in order to create a mood and tone of Gothic horror in the context of social realism.
In Jane Eyre, it is easier for characters to be morally pure if they are poor or if they refuse or renounce possible wealth.
Although other characters occasionally claim that Jane is beautiful, her beauty is always related to her mood or her character; it’s an "inner beauty" that the reader can only understand because Jane is a "plain, Quakerish governess" on the outside.
Jane’s claim that she is a "plain, Quakerish governess" is actually somewhat misleading; her attempt to hide her beauty from the reader demonstrates her belief that beauty and morality are mutually exclusive.
Because Jane initially learns to understand the world in terms of a teacher-student relationship, all her friendships have some master-pupil tinge to them.