<http://schema.org/keywords>
"Artistic, Artistiek, B&amp;W, B+W, Bejaard, Black &amp; White, Flip, Grieve, Low-Key, Man, Model, Portrait, Portret, Sadness, Senior, Sorrow, Verdriet"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/24268311/grieve-by-marco-de-waal>