As you go past Sindri's Shop, take the left path and look above the coffin at the end to spot this Raven.
Once you delve deeper into the area and defeat the Ogre, climb on top of the ledge and leap across the broken bridge. Head down the path a little and then turn back to spot the Raven on the wall above.
Once you've lit up the Light Crystal and head around towards the wind trap, you'll knock a bridge down. Look under and to the side of this bridge to find this Raven.
When you free the Dragon, Reginn, look behind the anchor that was binding him to spot the Raven in the distance.
When you enter the Stronghold, take a right into the room with the Jötnar Shrine and then a left to find a coffin. Look above the coffin to spot this hard to see Raven.