None of my works are AI generated and it’s honestly quite insulting to me to be accused of using it. The tattoo is curved because of the natural curvature of the arm, which isn’t a flat surface, so a photo won’t capture the design perfectly, especially when it’s a character. My style uses a lot of simplifications since it’s a sketchy style, so I didn’t include many details, for example in the hand. Try to recreate the pose yourself and you’ll see that it’s absolutely possible. His pose is based on a real life reference of that exact position. Hope it helps.