My own study of camera angles (borrador)

Low Angle: 




I have used it in order to show power, even try to make the viewer feel underrated.

High angle shot:



That's the opposite case, were the angle is used to get thee feeling of vulnerability.

Over shoulder:



Is the shot taked from above the shoulder of one of the characters, in it you can see a conversation or like in this case an action that is taking place.