Bofur70...Wildfowl Carving Magazine has an article in the most recent issue, FALL 2007. Part 1 - Carving. Part 2 - Painting will be in the Winter 2008 issue.
This is a miniature.
Keith Mueller has an excellent project book on carving and painting the Snowy Owl, published by Stackpole books, but you can buy it thru Fox Chapel:
Miniature Snowy Owl
A great reference for the Snowy Owl, as well as the Red and Gray Screech Owl, is Denny Roger's
The Illustrated Owl - Screech and Snowy
It isn't a how-to, but it does have most everything you would need for anatomy reference.
Hope this helps!