doesn't really look like a dragon to me. It is a terrifying image though so I can see why the Vikings included images of dragons on the front of their ships. It was a way to intimidate their opponents.
“It is better to live on the sea and let other men raise your crops and cook your meals. A house smells of smoke, a ship smells of frolic. From a house you see a sooty roof, from a ship you see Valhalla.