The background colours and design suit the characters and their stories so well. North looks so happily dazed and cutely sleepy. Jack is sulking but we all know that he feels the opposite of what he's showing his fellow Guardians. Bunnymund's smirk is confident and quirky. Sandy and Tooth look adorably bashful yet bright and cheerful. Awesome work!
I like your depiction(s) of each of the Guardians...
And I like how the color scheme and/or background not only matches/represents/symbolizes each character but it reminds me of the aurora borealis and/or better known as the northern lights...(which based on and/or according to the trailers, the aurora borealis, is the alarm/beacon to summon all of the Guardians)
I am also waiting, with exuberant anticipation (to the amusement of my family), for the Rise of the Guardians movie/film...(I am deeply intrigued with and about how they are going to innovate these well renowned characters from and of my childhood)
Keep up the great work, dahling!
Looking forward to more amazing artwork...
P.S. "...Thank-you, William Joyce, for the children's series 'The Guardians of Childhood' and Thank-you, DREAMWORKS ANIMATION for actually making a CG animated film/movie, out of one of Joyce's books..."