never underestimate your intro and conclusion.
in your introduction you should introduce and name all your texts specifically and state the themes you plan to discuss. this really helps the markers to see where your essay is heading.
the body should obviously expand on all these.
conclusion should restate the themes again (and texts if you want, although not as important) in a fresh, new way, so the marker can see how it all links for one last time. a conclusion can either make or break an essay, my teacher says, and i totally agree. you can even pre-write the conclusion while you still have time, then slip it in at the end.