1) 6 or 7. Could be higher with better hair styling and some fashion sense.
2) hard to say. It's a really terribly themed photo with a terrible expression and no body. Face seems like it would be really pretty if she was just smiling normally and ditched the cheerleader outfit. Potentially an 8 or a 9?
3) another difficult photo... black and white, no body. Face is pleasant but not remarkable. Probably wouldn't be more than a 7 if she was all done up.
4) a definite 5. Very plain face, the shape of it suggests she's got a body like a bean pole.