[s]*sighs deeply* I'll edit this when I get an idea. [/s]
I have two ideas, and I'll share one of them here.
a man, even though he is statically standing or kneeling on one leg (up to you) seems like he could move with great speed at any second. He is fully covered with a light plate of armor, aside from his head, which only shows his hair. his facial features and expression could not be determined, but is that a grin?
in his left hand, he holds a spear with a large blade: a combination of a twin-headed axe and a standard arrowhead. he holds it near the blade, like he could make a one-handed thrust with it. and holds it at an angle with respect to the horizon.
in his right hand, he holds a gigantic bow, mechanical but streamlined in physical appearance. its shear size surpasses the whole width of the avatar (it's meant to be cut if you drew it horizontally) as it seems to be taller than the man at the length. It is also large enough to accommodate the spear he's holding.
And now for the important part: the spear, the bow and the armor he's wearing seems to be made of a black metal. because of this, aside from the edges of the spear and the bow, and other markings and details, all the non facial parts of the drawing are violently shaded black. also, there seem to be... wisps of trailing light that orbit the metal components. I'll send you a PM for some detail on the 'wisps'.
The other idea I withhold, it's for when all else fails *winks*. I hope you're up for this challenge.