If this is something that is too vague or subjective feel free to let me know.
I propose a set of tags for different line techniques and various line asthetics/styles. With line being such an important part of the perception and impact of art, I think there could stand to exist a series of tags covering the aspect that is such a huge part of the definition of a piece. Right now we have lineart, no_lineart, and outline, a tag with seemingly no real definition.
Some possible tags to consider under this category-
thick_outline as in post #1188275
colored_lineart/coloured_lineart as in post #1200241
-multi-colored_lineart/multi-coloured_lineart as in post #1208367 (As well as several other ringetsumon posts, off the top of my head).
There are other, less easily named line effects, like lineart consisting of saturated, burnt variations of their surrounding colours, or variable_line_weight, but I'd like to know if this is the kind of thing worth identifying first and foremost.
Updated by pc88