It sounds hard and looks amzing. From the comments, it does'nt use any AI or LLM. Can AI make this better or worse? I feel AI is hard to make thing under control?
Thanks! I'm not sure that realistic color mixing or tonal value sketch can be improved in any way by AI. It's a pure math. A math models can be improved. For example, in color mixing instead of relying on sRGB color space which has limited color gamut, adopt CIE LAB color space. Paint reflectance charts can be measured with higher precision.
Probably, with the help of AI simplified sketch can be done. But I'm not sure that the simplified sketch made with AI will be better than the one made by applying the median blur.