I now have created the face, the back of the head, the neck and part of the shoulders are next.Starting with a sphere, I got rid of redundant polygons and extruded edges to form the shape of the back of the head. It was a daunting task for me because I accidentally got rid of the back parts of the polygons that I need but did not notice that I got rid of them so I had made my own polygons.
I attached the head to the face I had already created but none of the vertices were joined up. So I had to individually weld the vertices together.