Other things to consider

Point of View
A shot that is taken from the perspective of one of the characters is called a point of view shot (POV). It is used to make the audience see the scene from the character’s own eyes. A POV shot forces the viewer to intimately connect with a particular character and draw the viewer into the action. Often after a POV there is a reaction shot.

The crossing the line rule or 180 degree rule
This rule is applied when you are filming two people, especially if they are talking. An imaginary line is drawn through the two characters. The director must decide from which side of the line the filming of the characters is to take place. If shots are taken of these characters on opposite sides of the line the audience becomes confused about the action.

Click on this link for further explanation.
http://www.firstlightmovies.com/direction.php