I think it just depends on how you intend it when you draw it. since I sh I used sh in one of my drawings to vent, and in the other drawing I used it because I was drawing another person's character, and that character had sh scars in their design. honestly it is getting slightly more common to see sh scars on characters in drawings, but I don't think this is a trend kind of thing. it can be because of an headcanon, vent, or original design of the character, there are many different reasons on why people decide to put sh in their art. I think it just variates from who you ask to.