https://colab.research.google.com/drive/1e9jGVEGnvSaHqKdjzehhzSz-d4kRRYVh?usp=sharing is a colab I made to make images with Automatic Outpainting.
If you select the checkbox, you'll have the option to specify larger dimensions. The first prompt will generate the image's main (central/left/right) subject, while the second prompt will generate the remaining portions. Both will show up in the colab.
Outpainting is done manually, but the purpose is to avoid the proliferation of characters in a very large picture, as it often happens. And of course, you can make a 1st prompt and put it on the left, then another prompt you put on the right.
I put examples without upscaling.
https://www.youtube.com/c/JPRobocat
http://www.patreon.com/Quick_Eyed_Sky for prompts, tips, and to get help.