I love not only the faces but the consistency in the faces - that's something I have a hard time with, maintaining the same persona from one angle to the next in a person, but these are perfect. Did you use references?
I know what your saying. I think I mentioned in one of my journals that I used to be a visualiser, working straight from my head for quite some time. I basically worked to a formula to maintain consistency, but may of my works looked very similar and I wouldn't say they were near as well produced as the work I do now (though I still have plenty of room to improve). Perhaps many of those artists use similar principles.