I sharpened my skills under the mentorship of my coach.
You need a noun to complete this sentence, and mentorship is the only noun here - the rest of the words are adjectives.
Pandora is a goddess (if we're talking about the same Pandora) and she's the goddess of misfortune. I would assume that the political cartoon would be showing that whomever was "running" for whatever position was a mistake.
They feel as though the mans presence is ominous in a way, saying he's sullen would suggest he's viewed poorly by them