Our group has addressed these issues. It still is not clear and I want it to be simple and reproducible. So I have built a template for a character bible. It is attached. I also create an agent in Chat GPT solely to create books and this agent helps in keeping things consistent. If you want to know how to do this, go to our group and search the posts for agent. Use this template to lock in the characteristics of your characters, the style of your images, your text voice, etc. Follow the directions provided with the template.