The current progress with a filly model. I've got the eyes working (well, adopted the one from mythicspeed's BonBon model), thus far it's fairly usable for rendering still images (tho I'll most likely not deck it out fully for animation, I'll live that to animators).

The current one looks fairly decent from the side and front, tho from profile I might just paste over a vector, the profile foal head we see in the show doesn't really work in 3D with the other 2 viewing angles.

The base was renderingbytes 's filly Twinkeshine SFM model that I ported to Blender and modified quite a lot.