<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/9800435/w%3D160_h%3D160_s%3D1/c08c95190bda2b4f4f5940ddfc569719>
<https://marketplace.500px.com/photos/9800435/smooth-curves-by-fran%25C3%25A7ois-doroth%25C3%25A9>