Unicornst: I think someone with brows like your avatar would actually be an even better reference in this case. Not all women have the "ideal" bird-wing's shape with the relatively steep angle from the inner end to the peak. I'd have to look at some more references (yes, I do that on occasion, even if no "naughty bits" are involved) but I think that the positions of the inner ends relative to the eyes are probably most important for the perceived expression, and that they should generally be more or less at the same height as we see them in the Megan Fox picture.

-- I'm not mad at you, just Westphalian.