I so wanted to tag this traditional_media, but alas, the pixiv tags reveal the true nature :v

so then faux_traditional_media maybe?

That actually sounds like a pretty good idea for a tag, what with how plentiful digital "non-digital" images still are, though I'd wager it'd risk becoming a bit too subjective as to what should be included/what not in some cases that aren't entirely as clear-cut in their 'fake anolgueness'.