This Canvas art presents Viserion staying beside and protecting The Night King. Viserion was one of the three dragons born in the wastelands beyond Lhazar, along with Drogon and Rhaegal.
Viserion was turned into a wight after being killed by the Night King in season seven and then brought back to life which turned Viserion to an ice dragon. He lost his free will and was enslaved by the Night King. He was also able to breathe fire that was capable of melting the Wall, though it was blue in color. In this picture it clearly proves that Viserion is also belongs to the army of death because his wing are torn from some places, normally a living dragon can’t easily fly when their wings are torn.