Your Facial Expression reveals how you feel about your topic or issue.
Listeners are looking for cues about your attitude toward the subject. Be natural - don't try to evoke an expression.
A warm genuine grin works fine as a facial "ready position". Save your poker face for the casino.
Tight-lipped, overly serious expressions that are off-putting
Over-smiling - can appear insincere or nervous
Wincing, frowning or smirking creates a visual and then mental & emotional barrier
Tilting your head to either side can appear quizzical, unsure or cocky
Tilting your head back or chin up can appear arrogant
Be genuine, show natural and appropriate emotions for your topic
A warm, natural smile, lips slightly upturned at the corners, draws listeners in
Practice speaking and smiling in a mirror to see and feel your genuine smile
Practice showing different emotions in the mirror as you practice speaking
You become fully and genuinely engaged in your topic
Listeners more easily read your expression for the fuller meaning and intent on your words
Listeners find you more approachable, connected and genuine