The manner in which your model gives her/his facial expressions can go a long way in shaping your photos. A bland, emotionless expression might not look good. A slight smile, an off-camera look or even a cover tilt of the head can produce a far better and visually pleasing image than one where the model is giving a straight emotionless look at the camera. As a portrait photographer a majority of times you will come across models who are not professionals and therefore have no clue about how to pose or give a facial expression. To make matters worse, they would be tensed facing up to a camera. A good portrait photographer always brings out the best in his/her models. It is the job of the photographer to break the ice and to ease the mind of a nervous model. As they say, 80% of the energy of a portrait photographer him/her on setting up the model, speaking to him/her and preparing him/her for the shot. Only spent 20% of your time making the actual photos.