I've been doing portraits of People since the 2008 and I can only say that I look for some kind of "energy" in the connection between the subject and me/my camera. I don't know if it is essence or likeness, nor do I care. The human face is capable of an infinite range of expressions which are so subtle they can be called subliminal. I just go by my good feeling and hit the shutter when I sense the "energy" if and when it happens. There is no time to analyze if it is true essence or likeness.