Frequently, a new model will pose stiffly and without a lot of creativity. In other words, they know basic poses but haven’t learned how to make them unique unto themselves. As you practice, you will find that posing becomes easier and more natural. It takes a lot of practice and a willingness to experiment with facial expressions, arm, leg, hand placement, etc. You will learn what works and what doesn’t.  Ultimately, your confidence will increase and you will have developed a unique set of posing skills.