In fact, in my understanding, the so-called ethics of illustration industry is the basic ethics of human beings, and there are no more rules to abide by. Like don't steal, don't rob, respect everyone, protect children.

To be specific, consider the ethics of the content after the audience has been identified. For example, adult content should not be included in books that are likely to be read by children. If the audience is preschoolers, make sure the content is easy to understand and sensitive to children.

We should also avoid promoting discriminatory views when painting. It's not that there can't be a bad guy in a story, but that the bad guy's existence shouldn't be glorified. For example, in the movie The Joker, the hero is forced into a madman and a bad guy by the society, not to excuse him for doing evil, but to satirize and criticize the malicious and exploitative world.
The impact of environment on illustrators is more intuitive than we might think. Because everyone is influenced by the world, whether they like it or dislike it, they are essentially from the world, so the things that illustrators want to express and the views that they can't help focusing on are all from the feelings of the illustrators in this environment.

Illustration is the illustrator's way of putting out ideas and battles, only more civilized. It can also be used to protect the interests of people like LGBT+. narrative illustration is more intuitive and impactful, which is easier to resonate with viewers than simple pictures.