What does death look like in franz kemmerich?

Paul notices the signs of death on Kemmerich,

His lips have fallen away, his mouth has become larger, his teeth stick out and look as though they were made of chalk. The flesh melts, the forehead bulges more prominently, the cheekbones protrude. The skeleton is working itself through. The eyes are already sunken in. In a couple of hours it will be over.