<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/7599733/w%3D160_h%3D160_s%3D1/a0785c03b9bccb3fa49ef2caea21205c>
<https://marketplace.500px.com/photos/7599733/kiwi-delight-by-jason-stephenson>