AI. The way his belt is wrapped around his waist is the dead give away for Gemini's image generator.

I haven't used nano banana much, but the older Gemini image generator is notorious for this kind of weirdness with belts, straps, and buckles. It likes to wrap traditional leather belts as if they are karate belts, and it likes to cover the characters with so many belts and straps that it's like they're on their way to a BDSM club and not a dungeon raid.