I generally prefer playing monstrous characters in my roleplays, I enjoy the exotic nature of dangerous creatures and the differences that I get to consider and describe during play. To that end I chose a Temple Guard from Warhammer for my avatar because the artwork in question helps show off that raw power and primitive culture that I so often enjoy to embody.
I could change it to my OC I suppose but the action pose in this art better conveys the impression I want to make on people on this forum.