May Cho is seen here in the middle of her forehand pendulum serve, and at the end of her backswing. May performs this serve with her feet closer together than most of the male servers. It is also possible to see how May has loosened her grip on the racket, and how much of a backswing she is taking.
The free arm also should really be further out of the way of the space between the ball and the net, although this type of free arm placement is common among top players who learned to serve before the new rule modifications were introduced. (That doesn't make it legal though!)
