about presentations

In a good presentation,
the presenter use a lot of gestures,
takes eye contacts with all the audience,
speak in a clear and big voice,
speak confidently, lively, with facial expressions.
Also, in a good presentation, the speaker is sure about what he or she wants to tell the audience most.
... and the most importantly, good presentations are entertaining.

In a bad presentation,
the presenter speak in small voice,
the presenter cannot look the face of audience because he or she is not confident enough,
the presenter speaks too fast, with too much gestures,
the presenter speaks in a very monotonous way,
the presenter cannot organize what he or she is saying
the presenter get stuck in the middle because he or she has not prepared it enough.

This is my idea about good presentation and bad presentation.