<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/19067199/w%3D160_h%3D160_s%3D1/1d2efdedd2a00e197fc030f5b18a1be3>
<https://marketplace.500px.com/photos/19067199/autumn-show-by-chrissie-barrow>