For this look I wanted to create a desert/raider themed Asura.
I used mainly Black because it fits the Asuras Name (Kiro Black) and it is the best colour to wear out in the wastelands and deserts of Tyria.
The colours are also matched to Hair,Hammer and Backpack.
Since the chestpiece is covered by the scarf you can see his black skin. This is wanted due to the legendary hammer effect, since it does not cover skin. In this way you can maintain a colour variation on the character since the skin stays black.