If printed vertically (eyes up, smile down - standing on neck), tree support works pretty well, and is easier to remove.
Otherwise, if layed horizontally on back of head, classic support, even no support is OK.
I printed mines with « Meta PLA » filled @ 10% without any issue.
Designed with FreeCAD.
update (2023/08/14):
As the original model is not available on the site, here is a compatible link:
https://www.thingiverse.com/thing:2936306
The author remixed this model.