<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/26715223/w%3D160_h%3D160_s%3D1/d9be0fa7b9f5458522aae53af7fd6fa4>
<https://marketplace.500px.com/photos/26715223/an-arabian-landscape-colour-by-julian-john>