IOne thing that gives a shot more added realism is camera shake. No real life camera is ever as perfectly smooth as a cg move, so it helps to add a lot of jitter and roughness to the shot, either while rendering in 3d or later on in post. The smoke and snow being blown around in this shot was actual footage of white smoke shot against black and then mapped onto a large polygon with alpha channel in Carrara.
No portion os this website may be reproduced without express permission of Markus Rothkranz. Carrara, and Carrara Pro is a 3D cgi animation product of Eovia corp.