Ady, Considering the snowstorm tauntaun should not cast hard shadows. Even better not at all.

Han's shadow is animated too.

Considering that are two different elements the snow at taun's feet have too much definition compare with the other.

I added some haze/fog and more snow detail to smooth the transition.

See? no more blue :D

Edit: Luke sees the AT-AT from the right but Dack sees it at the same angle in the next shot, which is wrong(?)

Now 005 is good time to say : thank god that Angel was missing from ANH:R :P

-Angel