Cartoons can be inapropriate in a business presentation. Be cautious in using them Don't change type fonts. Consistency is more elegant than excessive variety. Avoid reverse type, light colors on a dark background are difficult to read. Use italics sparingly as they can be difficult to read.
Delivery is where many presenters fail.
Practice, practice, practice before you get in front of the class. Don't read the slides verbatim. This is annoying, since your audience can read, and implies that you need a crutch and are unsure of yourself. Don't stand behind the monitor as this hides you from the audience. Maintain eye contact with the audience.