I have seen No 3 before. I liked it then, and I (still) like it now.
Another vote for No. 3.
My vote is for N3 as well. Now why would we like her so much?
'Girl next-door' look. Natural.
3 is the definite choice. Maybe because she is relaxed and smiling while looking directly at the viewer?
Three too. Just a nice smile.#1. Don't do it.#4 Why do glum?