Cool thanks for your feedback!
I have Clip Studio Paint as well, it is a fantastic program and it is pretty cool that Photoshop brushes can be imported into it in the latest version now as well. I'll try to see if I can do the technique using Clip as well at some point. I'm sure it could be done.
I don't think there is a G'MIC plugin for it yet, but if you want to try that Krita comes with G'MIC installed in it or you can use it in other supported software's if it has a plugin for them and then import your pictures into Clip Paint Studio for the drawing bit.
Key is having good grain textures for the transparency mask and nice paper textures, it doesn't matter about using Krita, but I do like it.
You can use your own pencil shading gradient textures with the GMIC method as well of course, but I'll buy a Conte pencil and make one at some point.
I think this technique could work in most software with similar brushes, although I will say that Ramon Miranda's free charcoal brush set (which I've linked to in the article) for Krita is amazing, and my favorite brush for the pencil drawing is from an artist called David Revoy (his free brushes are also linked to in the article).