Hey man, looks good, I'd drop the background as the model is not completed as yet (more details in Z, colour, bump spec, etc) so it looks out of place at the moment.

Once youve got this animate are you going to try and composite it into a real video background etc?? Be good practice on rendering in different passes an compositing them.

Also if you do a video you can get your teeth in to maya live for the camera tracking, etc.

Looking forward to how you go about animating this beast, especially with all the muscles that you've added.