you can set the camera on a vertex and then you can make the camera look to another vertex (e.g nose vertex). here an example:
var tt;
var zz;
while(1)
{
vec_for_vertex(tt,my,421); //back vertex of the head
vec_for_vertex(zz,my,1094);//vertex of the nose
vec_set(camera.x,zz);
vec_sub(tt,camera.x);
vec_to_angle(camera.pan,tt);
wait(1);
}