This is where it takes time.
I always build the figure first, then I add the clothes. That way they hang right. Because there is so much of the head and neck area exposed, I need to make sure that the anatomy is correct.
First the skeleton, then the muscles over that then the skin over that. I remember back in my college days (1968-72) we had to memorize skeletal anatomy and the muscles just like the Docs, from the Gray's Anatomy Book. Then we had to draw it all and sculpt it. Four and a half years of anatomy and figure drawing.
a "Painter", I learned enough to pass the tests. After I graduated I
did not keep up. Why does a landscape painter need to remember the human
anatomy? Ah the wisdom of youth.
work first by adding the basic muscle shapes to the face and neck area,
then I work different from most artists, I detail the left side of the
face and neck only, then when I get what I want I do the right side. I
know, bass ackwards and it makes no sense, but that is how I work. The
wisdom of age.