Use simplified diagram with bold lines, icons or readily recognized symbols. Use bullets and other symbols for emphasis. Keep the transparency material brief. Check for spelling and other errors before using. Number the transparencies if they are used in series.
Final impression is the same importance as the initial one.
You should end your presentation with a decisive closing. After the presentation, you should evaluate yourself honestly. Try to figure out the problems associated with the preparation, or delivery , and make it better next time.