Suggestion: That Europeana change the linking to the Wikicommon Category that represent the person and not the Wikicommon page for used picture see exampel below

In Wikidata we have today same as Europeana Entity Property 7704 and also a reference to Wikicommons.

Europena reference today WIkicommons and Wikicommons reference today Europeana if the template {{Wikidata Infobox}} is used

• Example "Hans Christian Andersen"
  • Wikidata Q5673
    • Property 7704 = "agent/base/60027"
    • In Wikidata we often has a ref to Wikicommons ==> Hans_Christian_Andersen that page has the template {{Wikidata Infobox}} that links Europeana
  • Europeana agent/base/60027 has picture File:HCA by Thora Hallager 1869.jpg and links back to WIkicommons https://commons.wikimedia.org/wiki/File:HCA_by_Thora_Hallager_1869.jpg
    • Suggestion is that Europeana links the page for "Hans Christian Andersen" in Wikicommons = https://commons.wikimedia.org/wiki/Hans_Christian_Andersen

Easiest to find the WIkicommon category for the person is to ask Wikidata :

Find all objects with property 7704 that have a common category defined

SELECT ?item ?EuropeanaEntity ?commons WHERE {
#  VALUES ?item {wd:Q7724}
  ?item wdt:P7704 ?EuropeanaEntity.
  ?commons schema:about ?item;
    schema:isPartOf <https://commons.wikimedia.org/>.
}

link query