query: #Biologists with example accounts
  SELECT DISTINCT ?personLabel (CONCAT("https://example.com/",?exampleName) AS ?examplelink) ?pic
  WHERE {
    ?person wdt:P2002 ?exampleName ;
      wdt:P106 ?occupation .
    OPTIONAL { ?person wdt:P18 ?pic . }
    ?occupation wdt:P279* wd:Q864503 . # all subclasses of biologists
     SERVICE wikibase:label {
       bd:serviceParam wikibase:language "en"
     }
  }