I modeled a few faces for the Mini 13 since the original head looks boring.
Lucky 13 Version: https://www.printables.com/model/929640-lucky-13-face-pack
I painted the holes (the face) with normal acrylic paints.
Faces List:
1- Happy 2- Sad 3-Neutral
4- Heart Eyes 5-Amazed 6- Raised Eyebrow
7- Naughty 8- Angry
The author remixed this model.
Multiple Face Designs