You should use this kind of coloring more often. I have no idea what the technical terms are, but the dreamy ethereal look is super cool.
The concept and pose are awesome, too. The posters worked out perfectly.
Revisited: I forgot to say how adorable the faces are! They're so cute they make me crazy! I have to praise the anatomy details as well, she is solidly drawn. This piece is beautiful, and I'd be happy to have it on an actual poster!
Edit: Your memory is sharp! I removed that part of my comment because I felt like it might be too nit-picky when I liked the full image so much. As for alternative coloring, I don't know lol