I dunno if this picture counts as nudity but whatever, if ya don't wanna see ANY DRAWING remotely naked then skip
FriendscallmeMoonpie
Here's what I'm talking about
The line on the back is mostly obvious at the... rear end, and not so clear on the back of the torso
If you're drawing on digital
I think that's a Normal Brush in English ^^^
I erased one side of the line I drew with the Normal Brush ^^^
I advice lowering the opacity of the layer with the Normal Brush ^^^
Hope this smol tutorial kinda thing helps :)
Best of wishes,
PPurpleCChimera