500 + 602 + 790 = 1892. :)
1. be clear and concise - don't make it too long
2. highlight key parts about your life but don't go into too much detail
3. indirectly describe yourself. e.g you may be a confident person, but maybe, instead of outright stating it you could list a few things that have connotations of being confident. e.g public speaker
Ethos, because it shows credibility of her being a teacher for a long time, which would make her a trustworthy source.
