Green Enderman eyes

I think we should have Enderman have green eyes when there is no Enderdragon in the End. There are a couple reasons like when you get the advancement "Free the End" because you killed the Enderdragon implying that the Endermen were ruled by the Enderdragon. So it would be like lifting a curse off the Enderman. Enderman should also have green eyes because it would line up with their ender pearls being green. Finally it would also just be cool because when someone joins your world and sees and Enderman with green eyes they would be like "Oh cool, they killed the Enderdragon."