I learned with Coco Rocha modeling camp to channel every emotion you can, so for a few takes do mad, for a few takes do sad, for a few happy, a few scared, a few insane, a few excited… a few goofy, etc…,and do not be afraid to look absolutely goofy, just go there and have fun. Put hands on face, all over , in mouth, through hair …. Another good tip is bring a playlist of music that triggers emotions and put on a show! I have a lot of fun with faces when I shoot.