#3 looks hot! GOOD SHOOTING! I'd crop off a tiny bit of it at the top, and move the watermark to the bottom right, but #3 is the best of the bunch as a headshot. #4's not too bad either. In #5, with the chain-link fencing, it looks like this was shot with a cheap, Coke-bottle bottom lens like say, the OLD, very-first-generation Canon 18-55 kit zoom, the NON-USM motor one I used to have, back from the very first six months of the original Rebel...the optics show their limitations in that shot.
In #1 her skin looks, well, it looks very un-appealing to me. Dirty? Dusty? Sort of the same, but not as bad on #2. Those two are not processed all that favorably.
The one thing I would caution you about manifests itself in the last three shots; the focal length is TOO short,a nd you are TOO close to her. That causes her forehead to look massive, and her chin looks weak, because of a thing called perspective distortion. You want to shoot from a bit farther away, to keep the face looking pretty, and eliminating that receding chin-look. When the lens is too close, it makes things that are even slightly closer, appear noticeably LARGER than things that are only an inch or two farther away.