Visual Illusion
The image above show's a visual illusion since the shadow from the flag makes it seem that the lady on the wood is floating. Although we perceive the lady as floating the beach is inclined slightly thus making a shadow that looks like the shadow of the wood.
Initially it seems that the man has a long beard with his hands in his pockets but in actuality there's a women in front of him and he is touching her. This is a visual illusion because there are multiple ways of perceiving one image.
The picture above shows a man and the blonde women holding the women in the black dress, but you can also see it as the women in the black bending over and the blond women being held. There are multiple ways of perceiving this image therefore it's an example of visual illusion.