Figure VIII.1. The slaying of the Bull of Ishtar, from the painting by E. Wallcousins in Myths of Babylonia and Assyria by Donald A. Mackenzie. Project Gutenberg

The image is in gray scale.

In the background is a sky with cirrus clouds above a rocky plain.  
In the foreground, Enkidu lies on the rocky ground under his horse where he has been knocked down by the Bull of Heaven, the Bull of Ishtar.

In the center, facing right, is the bull.  His tail is raised, his horned head down.  The reamins of a net are over his hind quarters and several spears are stuck in his hide.  He is charging Gilgamesh.

At the far right, Gilgamesh is astried his horse, right hand extended having just plunged a spear into the bull.  His cape is flying out behind him, his horse galloping past the bull over the rocky terrain, the horse's head pulled upward as Gilgamesh dodges the bull's charge.