<https://ignitevisibility.com/#/schema/person/image/>
<http://schema.org/contentUrl>
<https://secure.gravatar.com/avatar/6f5a4cd87af779c047b1e4a3031da77a?s=96&d=mm&r=g>
<https://ignitevisibility.com/can-images-serve-404-errors-in-webmaster-tools/>