They're getting pretty dang close. Even they poke fun at themselves for some things being off, even though it's really good for CGI. I'd say it's the transitions between expressions seems unnatural, or perhaps her face is too smooth? If it was a still, you probably wouldn' t know at all.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.