Guess the medium: Painting, drawing or photo?

This is one of figurative artist Rob Hefferan's most recent works. "Come Here My Love" looks like a lovely wedding photograph, but look closer, and you'll see the tiniest evidence of brush strokes around the bottom of the wedding dress.

Hard to believe, isn't it? This neorealist portrait, called "Annabelle and Guy," was created by Israeli artist Matan Ben-Cnaan and recently won the 2015 BP Portrait Award, the world's most prestigious portrait competition.

This is a long-exposure photograph of the Elakala Waterfalls in the Blackwater Falls State Park in West Virginia. The effect is the result of a long-duration shutter speed that sharply captures the stationary elements of the image while blurring or obscuring the moving elements.

The late Amy Winehouse was immortalized in this charcoal drawing by Kelvin Okafor, a London-based artist who specializes in illustrating celebrities in a hyper-realistic style. Other famous faces Okafor has meticulously illustrated include Mother Teresa, Beyoncé and Princess Diana.

Brooklyn artist Alyssa Monks is known for her hyper-realistic paintings that have wowed visitors to her exhibits who thought they were looking at a photography exhibition. Upon close inspection, though, her paintings reveal thick brush strokes.

And it's not a 3D model, either! This shot of a new housing development in Mexico was photographed by Oscar Ruiz, who was working as a helicopter pilot at the time. It was named Photo of the Day by National Geographic in 2013.

The work of Madrid-based artist Pedro Campos is simply mind-blowing. Known for turning everyday objects into masterpieces, Campos specializes in oil-on-canvas paintings like this one, depicting three Coca-Cola cans partially wrapped in a plastic bag.