Book Reports / How to write a essay about Macbeth Motifs? [2]

So my topic is "How do motifs help farther character development in Macbeth". So far my thesis statement is

Throughout the play Macbeth, Shakespeare uses motifs like blood, sleep, and darkness to help farther character development.

I know it seems really bad, but can i get some help on it please? Some suggestions or even a better thesis would help. Also if any other 'motifs' would be a better pick. Thanks.