I have seen video footage of a modified model of the KvatchHeadPike aka headpike.nif to have a pointed ear and redder eyes, specifically the first one found when entering Kvatch, although I assume the change applies to all instances.
One clue might be in the footage at 43:41, which showed a daytime skybox in Kvatch while the dremora came out of that house where the head is (this ONLY happens when you charge the city with Savlian Matius after closing the Oblivion gate, where normally it has the dark skybox). May be unrelated though
