Few small ideas how to improve your presentation
Add progress bar to your slides - it can be as percentage, smooth bar or some icons from lighter to greyer
Never replace elements on the same slide - if you do that, they all be put at one time and place on slide during conversion to
PDF
Do not all the time have crossed your arms on your waste - make some gestures, used them to impress more instead just simple talk
Specify Rules - present them on the beginning - when to ask questions, how long it to takes you, and so.
Clean up before start - if there was other presentation, remove all the connected stuff to have clear environment for your presentation
When you bought presentation remote control, don't forget to bring it with you!
When you are wearing sweatshirt, it should be closed - instead you will look like a gangsta!