Some things that other people will see when you are speaking:

• Our face is our most important non-verbal message to listeners. They are put off by an angry or blank, disinterested expression.
• Rolling the eyes, frowning, or not making eye-contact all send negative messages.
• Some cultures find eye contact arrogant or aggressive. Know where you are and to whom you are speaking to create the best experience.
• Try to have an alert, pleasant, relaxed look on your face.