<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/8735342/w%3D160_h%3D160_s%3D1/24ee5bc5d46c5344d6e5054ed9e6b045>
<https://marketplace.500px.com/photos/8735342/2-flower-2-by-boris-tuchko>