None that can be shared here but it's my go-to method for everything I do. You can place a character, their outfit, the environment, and even their nude body parts in the collage and it works. Label each panel, describe them, and the model will handle them correctly.
Edit: The last video I shared here actually used one image for multiple panels from a webcomic that had different things going on and the model handled everything perfectly. You can have multiple subjects in one image so that's pretty much the idea