<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/20421513/w%3D160_h%3D160_s%3D1/dfc0273eb0757e7dd30d91a7da6d95f4>
<https://marketplace.500px.com/photos/20421513/the-downward-spiral-by-david-white>