He is Gustavo Silva Nunez of Venezuela.

GUSTAVO SILVA NUNEZ is a Venezuela-based artist who not only creates incredibly realistic beautiful paintings of swimmers, but also pose with them (mostly while creating them) in such a way that makes it seem like he’s actually interacting with the person in the painting. His creations are mostly with optical illusion effects. Check all the photos and be amazed.
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This painting technique is now being used all over the world and in art exhibits and optical illusion shops. In most malls, optical illusion paintings is one of the best offerings that people of all ages have been visiting, creating a spot with photo op area to make the painting be part of real life interaction.
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INTERESTING FACTS
An optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of excessive stimulation of a specific type (brightness, color, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences. Pathological visual illusions arise from a pathological exaggeration in physiological visual perception mechanisms causing the aforementioned types of illusions.