I wondered about this before but it might defeat the purpose of her character.

Why Can't Peacock Wish the Skull Heart for her eyes she had before they were grudged out back? How can she see from those eyes on her arms,is it connected to her brain or something she has the Argus system but how does that even work?

If she had her original eyes back as Peacock than it would be the same eye Color as the eyes on her arms.