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Although the competition isn't judged on the backgrounds. It's supposed to be about the character animation, if you're adding a background, take a deeper look at how you use perspective. The counter tops aren't all using the same vanishing points.
Great start on the animation though. Try to add more inbetweens to give a more fluid motion.
Description: this animation shows two scientists, in a lab. discussing if one has seen batman or not
Experience: about a year
Time taken: 3-4 days