something to debate:
CGI or model?
Its hard to tell from that picture but I recon that most of the head is a model with mostly the mouth CGi'd in.
Recon any close-ups as well would be a model with an extra details needed again CGI'd in.
Don't know why, theres just something about the quality of it that looks a puppet-esque with the mouth as i suggested.
And of course when it comes to have to walk or something then ofcourse CGI.