1. It's bad, the pose is unnatural and looks really uncomfortable. It's also out of focus, has harsh shadows, and the white balance looks off a bit.
2. The best of the series. She could be a bit sharper and the lighting isnt even. There is a darker area on the right of the picture. Also the shadows look a little harsh, I would've used another light or a reflector to lift them a bit.
3 + 4. Looks like the lighting is a little harsh again. The shadows behind her makes it look like you used on camera flash or something. White balance makes her look orange. Also on #4 it seems like the focal point is her hair and not the eyes. Getting the eyes in focus is crucial.