When taking cephs, it’s important to make sure that the ceph is an accurate representation of the clinical occlusion.
For example here on the left, it looks like that the patients has an open bite. However, when we look at the clinical pictures, it is evident that when the ceph was taken the patient postured her mandible forward.
On the right, you see the correct ceph that matches the clinical pictures.
This is a common error, and hopefully this will help you to avoid it.