Here's my take on Hræsvelgr (pronounced "fresvelgurr", sometimes written Hræsvelg, or Hresvelgr), who is, in Norse mythology, a jötunn (giant) taking the form of a huge eagle that sits at the end of the world, the northern edge of heavens. By beating his vast wings, he creates a cold wind that spreads through all the worlds of Yggdrasil. His name means "Corpse swallower", perhaps because he sometimes goes to Helheim to catch some dead to feed on them ?
I actually thought about adding more elements to this design (like chains gushing out of his cosmic wings), but I was kind of disappointed... so I just kept this basic idea of an "ice cosmic eagle" !