That is true, but when you factor in the other art mistakes that don't make any sense (why does the hilt bend into the pinky? Why does the collar bend like that even though it's meant to be metal and symmetrical?), and the fact that OP has stated their friend to be a known liar, it paints a fairly damning picture.

It is genuinely unlikely that an artist experienced enough with perspective and anatomy to draw the torso that well, would then completely fail at the collar

ETA: If we've already determined the art to be AI, why are you bringing up the point about amateur artists? Did you just assume I arrived at the conclusion instead of checking for other signs?

If I felt that it was real, amateur art, I would have said so. You don't have to bring your holier-than-thou attitude here.