There are a lot of things I can comment on but basically what you need on this subject is a make up artist and hair care.
As far as lighting is concerned. On the first one it looks like you just set up two lights and pushed the button. It's safe to just set up two lights side by side, meter and push the button.
The one string of hair you should notice and take care of that before shooting the button.
Also it would be better served if it was cropped tighter.
Second image I want to turn my head because of the compositon.
Because of her hair being not being managed properly with her brunette base and old highlights we are losing it in the dark background all together. This image would be better served with a hair light and I think she seriously needs to get her highlights looked into.
Nose shadow is distracting. Also what is the white at the top of the image? I see a hint of rim light on her shoulders and cheek area which is kind of cool. There is also a bump on her jawline by her earlobe that I can't figure out. Looks like a bee sting or a spider bite swell or something.
Again, what is really missed is not so much in lighting as it is styling and an mua. A lot of technical lighting b.s. can be overlooked with good make up and hair.