Rowling describes Voldemort as having pale skin, a chalk-white, skull-like face, snake-like slits for nostrils, red eyes and cat-like slits for pupils, a skeletal thin body and long, thin hands with unnaturally long fingers.
Even in the movies, after he gains his body, he has slits for nostrils.
Even in the movies, after he gains his body, he has slits for nostrils.