Use an eyebrow pencil or colored pencils. Some sets of colored
pencils have a nice selection of browns and tans. Eyebrow pencils
come in natural colors of course. (Eyeliner pencil tends to be too
soft for making eyebrows.)
The point needs to be sharp so you can get fine feathery lines. If
the tip is too soft, the lines will be way too thick.
One thing I have observed: those with LESS are more successful.
The eyebrows should be barely there.
Apply just a few feathered strokes. Near the center, don't go too
far out to the sides of the face. Feather it, which means it is done in
several small strokes rather than one long stroke.
Kristin's Cloud 9 Nursery adds the following helpful comments:
I just make them really thin and faint, lots of
feathery, light strokes... Then I rub over it with a
Q-tip to soften it up. If you hate it, you can rub most
of it off with a damp tissue and start over. But if you
let it set for a few hours (not sure on the time), it soaks
into the vinyl and won't come off.
I've heard that some people hold the side of a spoon
up to the eyebrow to use as a guide. That way they
can make them both the same.