[GA2] New missing image avatar

When we haven't picked out an image for an organism it will be assigned a missing image avatar that currently look like this:

<img width="256" height="256" alt="Image" src="https://github.com/user-attachments/assets/8534aa61-9ee9-4dba-9289-c76534a4cb7c" />

It would be  super if someone could come up with a nice missing image avatar (which doesn't have to look any like this one).