The picture shows three men and a woman, framed by the sun, the moon, and Saturn.
The men are identifiable as the Norse gods Tyr (god of war, whose hand got bitten off by the wolf Fenris, visible behind Tyr), Odin (who rides a six-legged horse [yes, we know that this horse doesn't look particularly extraordinary] and is missing an eye), and Thor (the thunder god, who has a really big hammer). The woman, less identifiable specifically by her attributes, is the goddess Freya.
In order, then, we have the Sun, the Moon, Tyr, Odin (also called Wotan), Thor, Freya, and Saturn. Or, Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday — these gods and celestial bodies gave the days of the week their names. Since the big red line is around Odin, the answer is Wednesday.
Art credit: Erin Elizabeth