How These Pictures Were Made The technique is simple. Most of these photos are double exposures. Take one picture with your model placed and posed. After the first exposure, have your model move from the scene and make a second exposure on the same frame. The result will be a see-through ghost image.
Some exposure compensation is necessary.
If you want your ghost in a photo with a real person, the real person must remain in the same position for both exposures. There are many special effects that photographers can use to create images which depart from reality. If you like taking pictures, use your imagination to create your own special images.