yeah, you should read over the notes from the marking centre for module B from the last two years, they are pretty pointed. i think the markers want candidates who have a detailed knowledge of the text itself (themes/structure/characterisation) and have drawn their own conclusions. basically its not enough just to memorize different readings and critics without 'engaging with' the text itself.
as long as you have a balance of your own interpretation plus other perspectives (feminist, psychoanalytic etc) you should be fine. your own interpretation can be pretty much anything as long as you include an "i believe" or "i concluded from the study of this passage" etc somewhere in your essay.