Cyberia-Mix said:
I've thought of this before but imho that would only be useful when it's visibly mixed media. The lineart on post #668292 could very well have been made in SAI as well so I wouldn't count it (and I wouldn't even tag it nib_pen for this reason).
You don't think so? I wasn't even aware SAI was nearly so good as to emulate a nib in such a manner. Is it? I've never seen strong evidence for this, but if so, that's fantastic. However, the artist clearly marks つけペン on Pixiv and has a strong history of working in the medium.
More curious to me, though, why don't you consider visibly /trad lineart to be valuable? That visibility is precisely what makes it valuable. At least, that's my perspective-- seeing the application of technique in a real work.
And, like スラッシュ, I'd support a mixed_media or similar tag as a stopgap.