As a model, you should improve your posing for shootings, videos and catwalks. You pose in front of a camera or an audience.
Every shoot and job requests a different type of posing.
To practice the posing and find your best poses you can select pictures of top models on the web (e.g. pinterest.com) and practice their poses in front of a mirror or a camera. That will help you a lot and will make you more secure in front of the camera. In many shootings, the photographer will also guide you in the direction he wants you to be.