<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/4856534/w%3D160_h%3D160_s%3D1/7030e6a3a0e91d0b45e51ebe3ba1fcba>
<https://marketplace.500px.com/photos/4856534/untitled-by-anders-larsson>