I've studing these kinda shots lately and It's a package of things that plays a important role here...First the the way the model uses her face and eyes is very important! Then the focus on the lens focus should be sharp on the whole model! The way the model is playing an important role as well...
The light isn't the most important thing here...If you have a very light room it should be ok...The whitebalance must be correct! I can see on the second picture that they have used som kind of wind machine! very nice to add dynamics...
Remeber these pictures are not always made by the photographer alone...They usual tend to have a director who is coaching the models on the way to how they should stand, look and use theirs faces...
Hope that this was helpful...if not I have just wasted 5mins of my life
Gerry