Interesting, the more I look at the pictures the more I get the feeling that the newer version looks older. I only started after the patch, so I have never seen her ingame with the old look. But comparing the two pictures, I do get the feeling that the old Minthara looked younger. Not that she looks old per se, but a bit older and more experienced? Hard to put into words, sorry.
It's side effect of pale brows and more prominent eyeshadow. I once had to makeup myself to look older and I just used more prominent makeup, worked like a charm.