Besides the awesomeness that is the graphic novel itself, the English edition of Volume 1 of Siegried has a lengthy interview with Alex Alice and tons of concept art for the animated trailer. So if you haven’t bought the book yet, make your way over to Amazon.
I keep looking at all the art and reading about this comic and I think I need to invest in it. It looks SO good. And right up my alley! The pages in the comic are gorgeous too! As far as color and such. (well, from what I saw, anyways.)