The picture is titled “Odin and His Beasts”. Depicted are Freri and Geki (His wolves), and Hugin and Munin (His ravens). My only issue in this beautiful picture is that, if that is supposed to be Sleipnir there needs to be a few more legs 😛 According to the lore, Sleipnir has eight legs.
Sleipnir was the result of a night Loki spent with a giant. Loki turned Himself into a woman in order to keep the giant distracted so he couldn’t finish building Asgard’s wall. Had he finished, he would’ve won the hand of fair Freyja. Of course thanks to a scheming Loki. But, as He usually does, Loki untied the knot He had gotten Himself into, and managed to father the horse that allows Odin to travel to Helheim and back.