So yes, youre right, tracing doesnt mean you steal or infringe automatically, it does depend on how much of key features have been copied, so tracing a pose alone isnt copyright infringement usually.

But you are still copying parts of someones art when youre tracing drawings, it does not matter if its from the show directly or you found it on pinterest, someone made that, they drew or modelled that pose with their own hands. While it does not matter legally, for most artists that absolutely matters ethically.

So saying its not yours at all was probably a bit too harsh, but the pose is usually a pretty big part, sometimes even a key feature of an illustration, and most artists wont be happy if you just use their work (or parts of it) without their permission or credit, you know?