According to Aristotle, there are three categories of ethos:
1. phronesis – practical skills & wisdom
2. arete – virtue, goodness
3. eunoia – goodwill towards the audience
To judge whether or not a conclusion is successful, simply look back in the story and try to relate things in the story with the conclusion. Depending on what you find will determine whether or not the conclusion is successful.
I'm pretty sure the first sentence? Everything else sounds a tad opinionated.
When you site your evidence, make sure to quote it and say what number paragraph it came from