Cyb,
Looking at the profile pic, I'd suggest that you double check the size of the ears where they connect to the side of the head. I realise that the angle is not exactly the same in your comparison photo, but the ears on the sculpt look quite a lot taller than they should if you look at the real puppet photo. Also, I'm not sure if it's the way you've added the white background, but the little bulbous chin shape doesn't look quite right. The mouth is opened pretty much the same in both pics, but the chin shapes look noticeably different.
Just thought I'd better throw these comments out there so you can double check against your movie reference pics.
Chris
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