High hats will show all the wrinkles on your face. Light coming from the front will usually provide the most flattering light.

Yes. Master bathroom vanities need lights either hanging over the mirrors or sconces on either side of the mirrors. But remember, the most important light fixture in a master bathroom is the small chandelier wherever that makes the most sense to hang based on your configuration. And then remember next that chandeliers do not have to hang low, they can be flush mount up against the ceiling and still provide that visual impact and drama.