What do you call these pictures / illustrations?
In german it can be called Wimmelbild. That's usually for kids, where they can find stuff, think you call it where's wally in english:
https://de.wikipedia.org/wiki/Wimmelbild
Here is some discussion about the word:
https://dict.leo.org/forum/viewUnsolvedquery.php?idThread=706597&amp;idForum=1&amp;lang=de&amp;lp=ende
They call it &quot;crowd scene&quot; or &quot;illustrated panorama&quot;.