<http://schema.org/image>
<https://drscdn.500px.org/photo/18958433/w%3D600_s%3D1/76a38361e7056bed1f6104b590f2f310>
<https://marketplace.500px.com/photos/18958433/graffiti-by-juan-ballesteros-l%25C3%25B3pez>