-Headroom: Enough room for the subject's head. Too low in the frame (too much headroom) makes them appear short. Not enough headroom makes them look tall and scrunched. Correct headroom gives the subject just enough space around their head to make them look comfortable.
-Eye placement: Should be in the top third of the screen (see rule of thirds). You want the viewer not to notice the camera-work so, make it look natural and standard.
-Eye placement: Should be in the top third of the screen (see rule of thirds). You want the viewer not to notice the camera-work so, make it look natural and standard.