You could also just place a null on each doll where the mouth belongs in C4D and bring those nulls and the camera into AE through Cineware. Then you can position the animated mouths (a 2D texture) in 3D space (as children of imported nulls)and the mouths will track and orient to the angle of the dolls. If you use an alpha for the mouth it will seamlessly matte onto the face. (I would recommend removing the static mouths on the 3D dolls first in your 3D texture).
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If you asked a question you might not get a response – this may be bug on my end or in the Cow, but you post is a copy of a reply I gave to another user on the topic russian dolls and C4D. Just thought you should know.