First: BOTH WERE VERY GOOD! (very honestly)
It was very close, but I give it to Baka. He did a nice job with making the background interesting, but it definately ended up overpowering the render. Aurora's had a better artistic concept (though the "choose the box was a better conceptual concept", but what lost it for her was the underdevelopment of the background. I would have reccomended sprucing it up some (not at all like Baka's because you want to keep the serenity/animated quality of the render) but just give it some more attention/realism/variation/subtle detail. The hatching shows that you were thinking of this, but you needed to give it a bit more attention (it was too flat). (then you would've won assuming Baka's was the same.)
GOOD JOB BOTH OF YOU! This was the best duel I've judged.