Thor fighting Jörmungandr, the Midgard Serpent.

Thor und die Midgardsschlange, A painting depicting a scene from Ragnarök, the final battle between Thor and Jörmungandr.by Doepler, Emil. ca. 1905. Walhall, die Götterwelt der Germanen, Martin Oldenbourg, Berlin

Source: Wikipedia

In the foreground, a large serpent glides over a rock outcroping, mouth open wide, fangs and tongue extended, while flames shoots from its mouth.

Facing the serpent, engulged in flames, his left arm holding his cloak up as protection from the serpent, Thor has his right arm raised holding his hammer, Mjölnir, ready to strike the serpent.

In the background on the left, the silouhette of a city burning. 

In the background can also be seen, in silouhette behind Thor, a group of men fighting.