i found this part quite tricky as i didn't know where to start to produce the front of the neck.

i started by selecting edge mode, clicking the corner edge of the neck, and then copying it several time until it was in the correct place, i used the photo planes for this.

i then positioned it so that it was the correct shape of my neck.

i then copied the polygon down that i used to join the back of the neck and the face, to where it meets the new part of the neck.