Content – What did this reveal about you? What did this reaffirm about you? What nonverbal behavior (because after all this is often 93% of the way we communicate (Yaffe, P., 2011, http://ubiquity.acm.org)) will you use to bring Hidden or Blind adjectives into your Open self? How will you use this in your public speaking career?
Just be honest and reflect. You could also write about how you are planning to bring out some of your unknown characteristics out (i.e. travel, reading, new experiences, etc.).