Did you prove your thesis? Using what evidence? Make sure that your evidence is strong; if you have doubts about a point, get rid of that point rather than weaken your argument with flimsy proof. Make sure you have enough evidence to support your thesis. If your assignment states the amount of evidence required, ensure you have that amount. If there are no clear requirements, three is usually the magic number for proving a point. Of course, if you have more than three strong points, no one will complain.
Double-check your direct and indirect quotes to make sure you’ve made no mistakes while transcribing them.