What is the most important aspect in a portrait, be it an individual portrait or a group portrait? It is the faces of the people being photographed, not the background nor the lighting. That is the first thing people look at in a photo.
For us at Identity Headshots, our focus is the person's face. That is why headshots is our speciality. Nail down the face, and the beauty of the posing, background and lighting is just gravy for a portrait.
For best results, we recommend doing the headshot sessions prior to the group portrait session.