There was some confusion in the discord as to whether child posts of the sketch with the finished artwork as the parent should be tagged with "making of" or "unfinished", because of the (mistaken) belief that the "unfinished" tag was only for things where the finished version was never uploaded and others pointing out that the "making of" tag was only for things showing multiple parts of the process in one post. Only for for @HeeroWingZero who wrote the wikis to point out that such "single stage" child posts should be tagged "unfinished".
Progress gif/timelapse/etc: post #7495367, post #7463546, post #7333031
Still image showing multiple stages: post #7263671, post #7444526, post #7350406
Still image showing single stage with finished version as parent: post #7443994, post #7431519, post #7491160
Finished version unavailable: post #7443835, post #6902668
Personally I think we should have a way to filter for or filter out works that were never finished at all as people looking at progress pics to study the progress and how different techniques turn out might very well want to filter out sketches that were just never finished and I also think it could work in cases where people wonder "why tf is only the sketch uploaded".