Make it Natural

Body language should look natural and unrehearsed and be consistent with the meaning of the words being spoken. Using body language that is comfortable for you and enjoyable for the audience takes thought and practice.
After you have drafted your speech, read it and not any places where body language would be appropriate and help convey your message. Try several different ways of using your arms, hands, and facial expressions.
Match your gestures to your words. You should be compelled to gesture and make facial expressions when your thought requires such action. This means your gesture or facial expression should be done slightly before or as you speak, not afterward, to look natural.