I came last, so I'm not exactly in a position to comment, but whatever.
KoA's sprite is incredibly unique and ingenious, but just looks far too dramatic to be in a Pokemon sprite.
Aragornbird and Cartoons! both have great front sprites, but it seems to come down to this: Aragornbird has the best back sprite by far, while Cartoons! has the best shiny sprite.
So I have to go with Aragornbird on this one. Again. Maybe next time...