绘画过程:https://www.bilibili.com/video/BV1FopfeJECN/?share_source=copy_web&vd_source=1d73fe9907f0681fac08af6d82ef3d26
Making-of: https://www.bilibili.com/video/BV1FopfeJECN/?share_source=copy_web&vd_source=1d73fe9907f0681fac08af6d82ef3d26