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.
Ragnar Lodbrok from the Viking TV Show with a raven on his shoulder. According to Viking mythology, Odin would often appear as a raven. Ragnar Lodbrok claimed to be descended from Odin and many Vikings believed this.