https://www.photigy.com/how-to-make-a-composite-image-in-photoshop-post-production-tutorial/

Sometimes a photographer makes several images instead of a single one and then blend them together in Photoshop. We call this technique “making a composite image” and it may save time and effort for a photographer when a subject is complex and it is hard to get a perfect picture of it in a single exposure.
This is a real-life example of how I did this for this Movado watch..
Stick around as we will be releasing additional videos to further refine and complete this image.