Are you making these trademarking errors? – Entrepreneur...
"Skateboarding doesn't make you a skateboarder. Not being able to stop skateboarding make you a skateboarder."
Contrast- There is contrast in the black and white. The shadows are black, while the white is where the light is coming from, probably the sun. There is also a contrast in the amount of space that the person is taking up in the picture, compared to the wall he is skating in front of.