It is quite striking that no two photos actually look like the same person - crudely similar, but the face shape is all over the place. I would think this is a

It is quite striking that no two photos actually look like the same person - crudely similar, but the face shape is all over the place. I would think this is an especially long “last mile” for training and fine-tuning: this might need a more sophisticated approach than a diffusion model, e.g an initial 2D->3D layer that first creates a 3D representation of the user’s face from a photo.