Very few girls post pictures of their faces and I think it is fair. But obviously it could be a problem for people like you who only care for the looks.
Personally I have never walked. Firstly because I do my research. Secondly, as much as I do care for looks, looks are not end all be all for me. Decent body, good service and good attitude do it for me.
Although I have never walked, once I cut the session short because it was clearly a scam. I was horny and just went for it blindly.
Twice I left because of lack of service and co-incidentally they were both Asian. In one case, I did read a review of a member who posts a lot of, mostly positive reviews, of Asian girls. Now I don't pay attention to him. Second time, I had not done my research at all, the girl was new. Lesson learned.
As much as I understand one walking because he doesn't like what he sees, I personally would NEVER leave just because of the face. Unless, of course, I was shown an apple and an orange opens the door.
T8E