A smile is warm and welcoming. Most professionals want to look friendly, and a smile can be a great way to make a friendly impression. Sometimes a subtle smile can be enough, though, as long as it’s backed with warm and confident body language. It’s best to find a photographer who understands how posing and body language interact with facial expressions. That way you can trust them to direct you throughout your session. Having that trust will allow you to be relaxed so you can shine your light in your portraits.