First of all, you need to listen all directions of the photographer very carefully because he knows how to do things in an appropriate fashion. You need to deliver facial expressions as directed by your photographer to get best photo shoot.
If your photographer wants you to smile then keep on smiling during the photo shoot. If he wants you to bring sad feelings on your face then you should try to follow his instructions in order to get positive results.
It becomes difficult to convey different emotions as instructed by the photographer during a photo shoot. However, you should try your level best to convey facial expressions during your photo shoot if you want to become a model.
You should practice different facial expression in front of a mirror before the photo shoot which will help you to follow the instructions of the photographer.
Posing for the photo shoot depends on your effort and also depends on your level of understanding as many people fail to follow the instructions of photographers and end up in getting an average photo shoot.
Try to make yourself comfortable with the changing instructions of photographer during the photo shoot. You should be flexible and should stay focused which will help you to strike a desired pose that will help in completing a great photo shoot.
You should never let contrasting expressions appear on your face because it will expose your lack of skill and focus. Always strike a pose that your photographer wants as it will help you to become a successful model.