You are correct from a purity standpoint, on the blood. With the increased resolution we can only guess at certain aspects of what should or shouldn't be there. For instance, Goro's foot wraps are super white in the original, but that just doesn't seem right given his Lair environment. I'm creatively extrapolating here that Goro has perhaps recently killed another opponent prior to fighting you. There is evidence that supports this theory given the blood splattered on the left and right walls. Also that original blood splatter is a bright red as though it was fresh. I like the blood. I also like that he is dirty looking. I think the smeared blood and dirt are more than cosmetic. They help tell a story. Did Goro just destroy a previous opponent? That's intimidating. It helps evoke that emotion I had when I was 12 years old playing MK1. I remember my heart racing as people crowded around the arcade to see if I could beat Goro. I think the blood helps sell the intimidation factor.
As for the red eyes, I don't have the picture now but the original intention was for Goro to have red eyes. It seems that in the end they decided to turn his eyes black. It was a tough call, because lots of people were calling for his eyes to be red early on when Gojira built the model. That being said, I agree with you on this. I'll change his eyes to black. I agree, the red eyes aren't making him look intelligent and the horror factor is lost.
So I'll compromise here, remove the red eyes and turn them black but keep the blood and dirt. It is in my opinion a small improvement which I think the original creator's would agree with if they were standing in our shoes today.