In addition to the afterwords on last pages, here to explain the choice of going monochrome instead of full-colour. In fact, generating coloured-work can achieve great result with AI, just like the last page uploaded.
However, we need to know that full-coloured work is more like a "commissioned illustration" rather than a comic. More importantly, full-coloured pictures cannot achieve the same result of having a simple, gradient background in some shots; it is better to generate a complete background when generating full-coloured pics, but by doing that you will make the overall look of a given page too complicated/messed up. Therefore I gave up on this.
If there were to be any further works, maybe I will try to swap the full-body pages during the story into coloured ones. That said I am uncertain if I will create any other work(s) because, despite it looks/sounds simple, I had to "roll" the generated pics because a single/few attempt may not get what is usable. Some shots in this work took me 20+ generations just to get close to what I want, before I had to "polish" by correcting details and feeding the corrected pic back into AI for it to iron out the inconsistencies between "what I corrected" and what it generated. This is a painful process and took a lot of time... and well this is pretty much it.