Help me improve the last page of my OTHELLO coursework - need to get an A?

Well I'm sorry to tell you this after you've written it already, but you are just describing Iago, not the audience's relationship with him. The relationship is that through the whole play, the audience knows how awful and deceptive Iago is. However, the other characters in the play don't see this, so it causes dramatic irony. The impact is that there is this tension where the audience wants to see Iago fail or be exposed as he continues to trick people. The audience can also be frustrated by the other characters inability to see what is happening to them. etc etc.