Here is a 3D face mcpe Bedrock Edition. You see different colored eyes with different emotions. But what if you put it in Minecraft and play? You will see that you are a realistic player. I don't think I will ever be able to add face animation, but I will be able to add new emotions and eye colors.
Select version for changelog:
Changelog
The description has been changed, if it is translated into other languages, it will be somehow incomprehensible, I needed to change it better and more clearly.
Finally, can you try to add in for example one eye blue and one green eye. Like make it have different eye colors in one and make it rare because it's rare Irl.