It's pretty difficult to change your self-image. I mean, it happens naturally over time but it's far from an immediate thing. One of the reasons Water Vatis often escape wrinkles or other outward signs of aging is due to the fact they don't see themselves as wrinkled, and so when they heal themselves their skin is rejuvenated.
Often, to actively change your self image requires lengthy meditation. The system I think I'll use for it will be sort of like it's own school of elemental magic, with a Grandmaster being able to change their entire appearance on a whim and an Apprentice maybe able to alter their nose a little, and the shape of their eyes. Enough that someone they knew would still recognize them, but to a stranger or someone they've only met once or twice they'd be unidentifiable.
A novice wouldn't even be capable of that much. Maybe changing the color of their eyes or something of that sort. Cosmetic only, essentially.
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