Hi, Here is my answer about the teddy bear and my friend's answer about the robot's face and the lighting. I hope this answers your question. :)
LucyCounty: "Since Lucas's concept was to create a small toy looking to a giant toy certainly deactivated, I asked him what kind of toy he had in mind. He let me develop it freely, and because I love teddy bears, that's what I decided to make."
lucasbs8: "Regarding the hat, I ended up lowering it to suggest that the robot is deactivated, while the lights were because I was practicing lighting composition."