They must have spent hours in makeup with Lena for that picture. She looks almost normal. Every other picture I have seen (not that many, admittedly), she looked, well, like she was dressed in clothing from the flophouse lost-and-found and groomed with a hacksaw and gravel rake.
Lena Dunham has pretty eyes, a clear complexion, and a good haircut. If she wanted to, she could look unremarkably nice. Clearly, she doesn’t want to: she wants to look awful.