Yup - number 4, as is feels relaxed, and not trying too hard.
She has a lovely face, but the others look as if she is trying to be sexy, when she is more so in number 4 (this might be just me, as I am not big on glamour photography)
They are all well executed, but not relaxed.
However, all are better than I could do, so no big put-down..!
As Betty says, the backgrounds of the first two look strangely odd - almost 70's style..
Number 7 is my next favourite, as the tones look good as does her face