Female Face Studies

Yeah so I decided my new goal for the next couple of months is to hone my skills at drawing the female face which means doing study after study after study after study. Direct photo reference:

First one I struggled hard core with the makeup and my colors were very dirty. Second was a little better but the skin far too rough. Third and fourth I feel I got to the proper intensity and fixed a lot of problems so I decided to do a no reference version to solidify what I had learned:
Left is purely no reference. Right is a revision after sitting on it for a bit and comparing it to my references (mostly just punched up some more dark tones)