This is by far the most troublesome model I have ever made. Unlike my previous models, this one not only has shape keys for the head, but also for her glasses, hair, and headphones. The glasses are used to adjust the visual effect when viewed from the side. The headphones and hair have two states: headphones on the head and headphones removed. Additionally, the headphones are controlled by a bone named 'headphones', located at the head bone (you need to enable X-ray view). Its default parent is the 'head' bone. If you remove the headphones and do not want them to move with the head, please manually change their parent to the 'chest' bone.