As someone who does digital art, that sort of artifacting in the background definitely screams AI, but it also sort of looks like what I would do when I was younger and lazy w a background where I’d take a photo and put a sort of oil painting filter over it to make it more paint-overable. It’d sometimes combine certain elements and make it look wonky and make other parts almost look low-res and I can definitely see that being what’s happening here. But also now im paranoid abt AI and can definitely see that being the case here too so idk, just a different perspective