for this kind of shot, i agree with xantor, use the main or auxiliary camera. set focal length to a minimum of 80 (i use 100). with these cameras, you'll have more freedom of movement, like a real camera, than the dolly while the face camera will remain pointing at ... the face. BTW, i use the face camera primarily to "zoom in" for posing the head and setting up facial expressions, not rendering. :-)