
Wait guys, I need a reminder. Does she see herself—her appearance I mean—differently from how other people see her as?

Yes she does :) she sees her actual face and hair color, however everyone else sees her as a girl with brown hair and eyes.
Spoiler.
Diana can also see her true appearance because she is the saint. That’s why Diana stared so intently at her in her previous life and why she loves her so much in this one as well :D
Surely there's a next part...