I like the look of the pigs, but I also agree that the charaters need to shift around, maybe add a blink or two in there which will make them look more alive, and probably more stunned/confused about the situation.

I think the colours are a bit of a worry. The tonal range of the pigs is completly different to the stuff outside. Think about light, and the time of day, and try and work that into the colour range.

What are you using for the 3D animation?

Be interested in seeing the final film.