Heimdall - the guardian of the gods who will blow the "Gjallarhorn" if danger approaches Asgard. His senses are so acute that he can hear the grass grow and he can see to the end of the world. He is the guardian of the Bifrost Bridge.
Heimdall is destined to be the last of the gods to perish at Ragnarök when he and Loki would slay one another.
Closeups you find here