Hi Nikolai...nice to see a model that does not look like a kid.
Some general comments, take or leave 'em.
1 is good, lighting a little flat on the face and the angle, white skin and dark background makes her nose overly prominate. Better to be a full-on profile, or bring back a little and get both eyes in the shot.
2 is the best of the bunch, IMO, by far...an outstanding photo! Lighting is excellent, pose is good, her looking at the camera, while certainly not necessary, is full of low-wattage energy...nice!
3 is good but her look is akward...she looks a bit strained and the head is low so it does not flatter as much. For this kind of pose, try an angle where she is looking up. It elongates the neck and streches out the body.
4. Yikes, sorry, looks like she just got hit by a bus...but does not really mind that much.
I keep going back to 2, wow, great shot!!!