Blood was a handsome and great dude while alive, working as a champion for mankind. Why would he be a horrifying monster in unlife? If you ask me, that's the point of why he looked like he did. Although, like I said earlier, the manga still did it a bit better. You ask me why I fixate myself on some looks, but I could ask you why you fixate yourself on hoping they would look more terrifying. They were great parents and a grandpa for Will, so I don't quite understand why or how they would need to be any scarier. For comparison, if you think of Ainz Ooal Gown, he's not a reanimated human skeleton. I don't remember what he is, but he's some other monster. He's also evil, so it makes sense he looks more evil, store wise. There's a distinct difference here.