A method may include: receiving facial image of the patient that depicts the patient's teeth； receiving a 3D model of the patient's teeth； determining color palette of the depiction of the patient's teeth； coding 3D model of the patient's teeth based on attributes of the 3D model； providing the 3D model, the color palette, and the coded 3D model to a neural network； processing the 3D model, the color palette, and the coded 3D model by the neural network to generate a processed image of the patient's teeth； simulating specular highlights on the processed image of the patient's teeth； and inserting the processed image of the patient's teeth into a mouth opening of the facial image.
