You begin pointing to her face, adjusting the blue light's selector to medium . You pointed the flashlight directly at the area under her nose, and smiled while there she started to develop some stubble, that suddenly developed into a decent "Freddie Mercury" moustache.
Thinking that it isn't enough, you beamed the blue light so her chin, then to her cheecks until her entire face was adorned by a clearly visible stubble, like that of a man that didn't shaved for two days or three.
Then, for now, you switch off the light and enjoy looking at your creation: you see still a gorgeous young woman, but her attitude is now that of a young man, and on her pretty face she sported a stubbble beard and a thick moustache.