Interesting to read your comment.
I did at least: 140 X 15 = 2100 heads sculpting. However, all those heads are not re-sculpted, but they are (large or tiny) modification built from the previous head. I’d like to say that my head really start to form an ideal shape and ideal facial feature when I did my sculpting around the 1900th head.
So far, my hard drive is no longer able to store all my heads sculpt. I have to store them in an external hard drive or delete them.
If some strangers have ideal facial proportion, I also stare at them. If the situation is too embarrassing, then I come forward and introduce myself, and offer them some money to let me stare at their faces for a little longer time. In most scenarios, they laughed and did not ask for money.