A Sense of Purpose (Or Lack of Purpose)

Sometimes I draw with a purpose and sometimes I don't. Sometimes I just draw faces and I really have no idea what will come out. One line will lead to another and then another. What amazes me is that drawing this way results in something very distinct. Faces appear with definite character, but where did that character come from? 

It's something I drew and yet it feels like I had very little to do with the actual drawing.