I've wondering about the power of magic to bring about changes myself lately. There are two books about shapeshifting in our Library, and at least one of them claims that physically transforming yourself is possible. Somebody started another financial magic thread only today, asking "How much money can you earn each month through magic?" My opinion was and is that it will cost you lots of effort, magic can only help you to become amazingly successful, and yet there's also a thread about winning the lottery where magic is supposed to ensure that only the figures in your bank account will change, not your slacker lifestyle. So shapeshifting, winning the lottery, Kazaam!, and everything's new in a flash?
Since it's magic we're talking, appealing to common sense is not such a convincing argument as in mundane conversations. However, what to do when the fabulous Kazaam! method fails to work? Either you give up on magic entirely as silly superstition, or you try a more pragmatic tack which will involve more or less exactly the same measures you'd take in real life, only this time facilitated and enhanced by magic where a healthier diet won't feel like a sacrifice and frequent exercising not like a chore. I think everything is possible here that wouldn't require surgery or heavy medication otherwise. The Taoist Deer Exercise may increase your A cups to a Bs but won't give you a DD size, and don't think it's possible to alter one's facial bone structure by means magic.
A lot, and I mean a LOT, can be achieved by altering one's posture and body language with the help of magic. A steady bold gaze, walking with confident strides, a calm and relaxed demeanour, all of that contributes to an attractive appearance. Granted, all these interventions cost time and effort but the transitions will be smoother and 'feel' more natural.