Using simple images to represent peope in your case
In OLab2 and OLab3, we had a simple tool to create and edit Avatars. While this was easy to use, it had a lot of limitations.
Nowadays, there are a lot of 3rd-party avatar generator apps out there. Rather than constrain how authors will include avatars into their maps, we are encouraging them to use such 3rd-party tools.
Here are a couple that we have found: