<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/17811409/w%3D160_h%3D160_s%3D1/edb3d439a6ab8e05d6eaf61f65338da6>
<https://marketplace.500px.com/photos/17811409/wonderful-tonight-by-pheara-ma>