sketch
Translated tags have been removed, because artists tend to use this tag in a very misleading way.
A hasty or undetailed drawing or painting often made as a preliminary study.
Traits of sketches include rough lines, basic coloring, and left over structural shapes. If a picture does not have any of the latter please refrain from tagging it a sketch.
On the other hand, not all pictures with these traits are considered sketches, such as post #2721361 and post #2722170. Posts with proper use of the sketch tag are post #2720851 and post #2722791.
Sketches are usually seen in monochrome, greyscale, or spot color.
Abbreviated on pixiv as "rkgk", which comes from the japanese word for sketch (落書き, rakugaki). Note that the presence of this tag is not reason enough to use it on danbooru. The picture must look like a sketch for it to apply.
Sketches are not sufficient reasons for flagging. See howto:flag.
See also
The following tags are aliased to this tag: /sk, rough, and rough_sketch (learn more).