Which styles exist in tattooing?

In tattooing,which is also one of many art forms that consist of drawing, various drawing styles also exist. I will refer to them as styles of tattoo motifs, not tattoo or tattooing styles because a tattoo is just an application on the skin that consists of a motif, and tattooing is the process of putting ink into the skin using a needle.

Most popular styles of tattoo motifs are:
     -celtic and norse
     -new school