How about following up the concealer/powder method with some golden powder on top?
I usually get what I want from just covering the brows in foundation but when I want them really light, I just bleach them gently.
Depending on what the model wants after the shoot, I either dye them back into their original color or leave them as they are. It grows out pretty fast anyway, and the light brows are very easy to darken with powders or pencils while they are getting back to normal.

:sun
Monique Heijboer
Amsterdam - The Netherlands
info@moniqueheijboer.com

Freelance Make-up Artist, available for Print,Television, Video, Fashion, Beauty and Runway Make-up.

www.moniqueheijboer.com