Think for myself about the principles of appearance in the real world.
In the case of graphics engines like the post effect, if you program an image merely based on established rules and principles without consideration for the details or knowledge of how to draw pictures, the resulting image is, more often than not, theoretically correct, but somewhat unnatural. There are many things that actually occur in the real world, but are not described in general textbooks, so when trying to replicate a scene in a movie, if you implement an image by following such textbooks only, the result may become completely different from the movie scene. That’s why I think by myself of the principles of appearance and pay careful attention to the details while examining what the resulting image will look like and what will be different from the real images. Therefore, it is important for graphics engineers to cultivate their observations by regularly looking at a variety of expressions through films and pictures.