allegorical, literal, existential, archetypal, etc.? If you're supposed to be interpreting the book through these different lenses, then it sounds like you've already done the biographical approach. Now look at the text in these other ways. Does it comment on what was going on in history at the time? (Say yes or no, and then prove it, using historical evidence that you tie to the text.) Does it make use of archetypes that have existed across times and cultures? (Say yes or no, then prove it, giving examples of where those archetypes appear in the story.) Does the text contradict itself (break down) in any way? (Say yes or no, then prove it, by giving specific examples of where the text says one thing, but later says (or seems to say) the opposite thing.) Is it possible to take it literally? (Say yes or no, and then explain how the text could just be telling a realistic story.) etc., etc., etc.

I could be way off base, here, but that's my best guess as to what you're supposed to be doing. Good luck!