Amazingly, it turns out there are many guides to perfect eyebrows.
The 'use our pencil and all will be well" method
The "drawing eyebrows in a drawing" method
The eyebrow tattoo
The eyebrow dormer
and a eyebrow patent
"And then the lover,
Sighing like furnace, with a woeful ballad
Made to his mistress' eyebrow."
“The eyebrows form but a small part of the face, and yet they can darken the whole of life by the scorn they express”-- Demetrius