How do you keep characters positioned consistently within the same AI-illustrated scene?

I’m trying to illustrate sequential scenes with AI, and my biggest problem is not just character consistency but spatial consistency. I can usually get a decent character reference, but once I try to place that character in a specific part of a scene, facing a specific direction, sitting or turning a certain way, the model starts changing the rest of the image or losing the scene logic entirely. I’m currently using Google Flow + Nano Banana 2, with ChatGPT helping me write prompts, but the workflow feels slow and unreliable.