In this video from Dom Bower Photography, he demonstrates how to make it look like a person is levitating in a photo. He sets the timer on the camera and takes the picture of himself. It takes a few tries to get a picture where he is airborne when the picture is taken. The trick is to try to pose while jumping so that it doesn't look like you're jumping. It might take a few tries, but if you use some of the tricks shown in this video, you'll be able to take a picture that makes it look like a person is levitating.