My eyebrows were a lot like my moms, not necessarily a thin line, but thinness as in not much hair if you know what I mean
I was so embarrassed of my eyebrows but now I couldn't be happier, they are mostly the same shape now but just filled in more, took maybe 6-8 months?
so, yes.. there were places with no hairs, that now have hairs.. also my fiance's mom made him pluck his eyebrows thin and now his eyebrows look perfectly masculine.