<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/8571747/w%3D160_h%3D160_s%3D1/b3ec98f982758b36a7fc9e493d3a0c3f>
<https://marketplace.500px.com/photos/8571747/not-evil-by-robert-k-baggs>