Sorry to ask, but do you have a tutorial on how to run the cameras.py, and process.py? Like do you run it in the blender command, the console like the fotosketcher, or as a addon?
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No need to apologise, thanks for asking, I didn't explain that part in much depth, and you've inspired me to add some links to tutorials.
render_cameras.py and toon_shader_process.py are run inside Blender, as Blender python scripts. Here's a tutorial which goes into running python in Blender: https://www.lowpolymodelsworld.com/post/blender-scripting-for-beginners-a-step-b...
combine fotosketcher.py is run on your computer as a stand alone python script. The specific steps to run it will depend on your computer. Here's a tutorial about running it on windows I found by searching for "Run python Windows", there are similar tutorials out there for Mac and Linux. https://learnpython.com/blog/run-python-script-windows/ I personally run python on a Mac laptop via Visual Studio Code's inbuilt terminal.
I only skimmed these tutorials to make sure they seemed basically okay, but if they don't work for you there's lots of others out there.
Sorry about that and thanks for letting me know about the problem! I forgot to say you should install pillow https://python-pillow.github.io/