The 10 bestselling photos on 500px and why they're so popular ...

MICHAEL ZHANG, PETAPIXEL:

"It has been 2 years since 500px expanded beyond being a simple photo-sharing service by launching a commercial licensing system for photographers. We were curious about what the bestselling photos on the service are, so we asked 500px to reveal the top 10 and tell us why each one is selling so well."

Read more, and see the images, from here.