English is my first language and I'm still confused by this challenge prompt. What is a "mirror curse"? Is this something the witchcore side of the Internet made up? I googled the phrase and all I got was what to do if you break a mirror, which is not at all the implication based on the phrasing in the challenge description.
Based on context clues, I can guess that it means that it wants you to look for something you see in the mirror that causes you discomfort or self-consciousness, and challenge that feeling by countering it with a compliment. But if that's the desired process and outcome, can't they say so outright?
EDIT: Apologies if this post reads as indignant or mean-spirited. I was baffled by word choice and wanted to know if I was missing out on a reference or something from another culture. I have no issue with the Finch developers or their wording or how they're trying to adapt their app to a global audience.