Do we actually see the swirls of light about people's heads when they cast spells/use potions?
I dont really see it making sense that a drink would make your head start to shine (aside from illumination potions >.>)
That said, are the effects other than the lights of most of these potions visible? Like, if you were to simple say drink a owls wisdom potion, or a grace potion, Would there be any noticeable effect that someone observing would notice magic?
Or would it be reasonable to assume that certain potions (Not potions like barkskin, blur, or etc which had clear lasting visual effects) could be drunk 'incognito' without ICly tipping off an observer that are in fact drinking magic potions?