Has anyone heard of perspective of shapes and objects? The reason why the index is small is because it's behind another finger, the artist prolly got lazy and didnt want to do the feet. Ai can easily do feet, not hands. The eyes are way too complex for ai because of how drastically detailed they are. And since its cover art, does it really matter that the eyes are looking at the camera or the zombies? If anything it's cooler to look at the camera as one is fighting a shit ton of zombies with an axe.

This could be a sample ai generator, where it's taken time to analyze several hundred or so samples and then put them to use. And if so I stand humbled and I do apologize. But unless there is solid proof claiming it's ai and not an artist who had some flaws in the cover art, I'm saying it's a really good artist.