<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/20090033/w%3D160_h%3D160_s%3D1/c9b58aea08e940f994bd9e0b5f0da454>
<https://marketplace.500px.com/photos/20090033/colors-rgb-by-sathya-narayanan>