At the end, when Alice saves Batwoman, Batwoman quickly unmasks (Tommy Elliot is still knocked down on the floor; it's been a few minutes at best). Batwoman does not only wear a cowl, but also black paint on the eyelids to combine with the mask and intense lipstick. However, when unmasked, Kate's eyes are not painted and her lipstick is clearer in color. If she had used some quick implement to clear that, like a towel, the effect on her make-up would have been quite different.