Hi eran,
I think any procedural would have driven Hayao Miyazaki nuts. For me, he is the heart of the studio. When I think about his method to work, I’m not certain to even offer this procedure.
Here are ten years of his work in four hours. Official Japanese TV.
https://www3.nhk.or.jp/nhkworld/en/ondemand/program/video/10yearshayaomiyazaki/?type=tvEpisode&
That said, I do a procedural, but in the most painterly way; Cinema 4D allows this detailed look while not requiring much work.
Please have a look here
https://www.dropbox.com/s/kamki0b7qjkfkj7/CV4_2023_drs_22_TXtg_01.zip?dl=0
The key is a single painting or a roughly painted sphere to get the feeling of Ghibli; anything else looks more like something else. The Sketch and Toons Art shader then translate this:
https://help.maxon.net/c4d/2023/en-us/Default.htm#html/XARTSHADER-ID_SHADERPROPERTIES.html#ARTSHADER_TEXTURE
My best wishes for your project