I am trying to see if there's a term for what I'm about to explain or a better way of doing this. Basically, my company is filming an actor from the waist up for short, 1 or 2 sentence clips. These clips need to be strung together to look as seamless as possible.

The main problem is that the model has to rely on muscle memory to remember where her head (specifically eyes, nose, mouth) and shoulders are in the frame.

My solution would be to use a mirror with a hole cut out for a camera lens. On the mirror would be marks showing where her features should return to after she says something. 

Is this typical, or is there a better way to do this? Or possibly to have another monitor with an overlay of the original position on it? 

I'd just like to try to make sure she doesn't constantly look away from the camera to achieve this.

Any thoughts?