My friend does this!! She has lovely, natural eyebrows too but she shaves them off the uses black eyeliner to draw them on. It looks awful! Each to their own, of course, but sometimes they aren't even.
I think brows that have been shaped with a bit of brow pencil to give them a little oomph look great but not drawing them on like a pre schooler.
She told me that she doesn't like her natural brow colour as its 'too dark' yet draws them on with BLACK pencil.
I am probably being unfair but just a thought. What do others think?