Beauty spells don't really work the way most people think. They do not shape the way your physical appearance is, or otherwise make physical changes. Much of it has to do simply with how you perceive yourself and how others perceive you. Doing things that improve self esteem, like working out, getting a makeover, etc. that your parents would approve of and your friends can take part in could be both good for you and used as parts of the ritual, where you focus your energy within each little thing you do for yourself.
Positive energy, positive thought, and positive action go a long way in such things.