Inspired by images such as this, combined with the Hesiodic description:
Hesiod, Theogony 820 ff (trans. Evelyn-White) (Greek epic C8th or C7th B.C.) :
“Typhoeus; the hands and arms of him are mighty, and have work in them, and the feet of the powerful god were tireless, and up from his shoulders there grew a hundred snake heads, those of a dreaded drakon, and the heads licked with dark tongues, and from the eyes on the inhuman heads fire glittered from under the eyelids: from all his heads fire flared from his eyes’ glancing; and inside each one of these horrible heads there were voices that threw out every sort of horrible sound, for sometimes it was speech such as the gods could understand, but at other times, the sound of a bellowing bull, proud-eyed and furious beyond holding, or again like a lion shameless in cruelty, or again it was like the barking of dogs, a wonder to listen to, or again he would whistle so the tall mountains re-echoed to it.”