But as far as passing as a guy, I wouldn't guess from looks at all.
Which, of course, is the problem with these kind of posts. All too often it seems to be assumed that passing is based on a photo and nothing more, when, in fact, people tend to judge gender by something like 18 different clues, and they do it in a split second, without thinking about it. Its movements, and movement itself, gestures, posture - lots of things you can't tell from a photo.