This photo is partly effective. It is a fairly simple photoshop by having a big foot coming from the side then a person in a smaller size holding it up with one had. Although it does appear realistic, there is no way it can be in real life
Here's a tutorial on how to do double exposure on Photoshop. Inspire your creativity with our unlimited downloads of high-quality, royalty-free photos, vectors, illustrations & other design elements from GraphicStock.