Looking at a single frame at a time, it's nearly perfect. I think the problem comes in how something about the lighting is just a little bit off compared to the rest of the scene and how that shows up when the face starts moving.

It's something that works better for Leia at the end because, aside from the shortness of that scene, the lighting is more indistinct and washed-out, so the little giveaways of light on skin aren't as obvious.