I think you should up the contrast and lower the amount of shades.
In the face in the bottom right, it's hard to tell whether or not it's dirty, if the mouth is open or the lips are just dark, and the eye shadow looks more like discoloration than make-up. I think if you split up the face in more contrasted areas, it would read better.
I think you're focusing too much on detail and not enough on the basic shapes.