"All Witches are glamorous."

FALSE.

This is a more modern misconception. The people who make fictional TV programs and films are rarely doing so in order to portray facts, they are in the business to attract an audience and make money.
However, there are still lots of people who believe, without thinking, that Witches all look like Buffy and Sabrina and the Charmed Ones, etc. and that it is the Witchcraft that makes them look good.
Practicing the Craft does make one feel better about his/herself and encourage them to have respect for their mind, body and spirit. The self honesty that the Craft requires will result in a more positive self image.