Rule of Thirds:

A face front on in the middle of the grid is boring, so we must check photos and films straight after shooting them.
1) Too much room above subjects head.
2) Not enough room above head.
3) Cutting off at limbs.
- Subject cut just above knees, but room above head for a medium shot.
- Subject cut just above hips, but room on either side still.
- Still a tad room above head, eyes & face centre on screen. Room on either side or one side for dramatic effect.
- Close up; eyes in top two thirds of screen, and chin always in screen. Medium close up.
- Close up; top of head cut off, chin close to bottom.