My first time responding to the RP challenges routinely presented by the Anna part of Too Many Annas. And in the spirit of things, I'll respond as per Button.
What color are your character’s eyes?
Violet, actually, and rather a unique shade at that. Flecked with white, when it catches the light it almost looks like a luminescent lavender.
What is your character’s skin like? Does he or she have freckles, tattoos, or other noticeable markings?
One of the reasons Button wears his goggles so often is a hairline scar running down his right eye, trophy of the battle against Ner'zhul and his death knights on the steps of the Black Temple. He also has a tattoo across his shoulderblades in some archaic language that reads "Loyaulte Me Lie".
How does your character smile?
Button has a genuine smile, reserved for his friends, that is rarely seen. Most of the time his grin is a sadistic one, full of savage glee as he hacks at the kneecaps of this tauren or other.
How does your character carry him or herself when walking around? What is his or her posture like?
Button is as proud a Gnome as there ever was, though he has little time to actually associate with his brethren. He stands proud, with his weight evenly distributed on both legs, fingers flexing, always ready to attack or defend.
Describe your character’s hands.
Scarred and calloused, used to years of warfare, holding a weapon. Powerful fingers, for a Gnome.
And there you have it. That was actually sort of cathartic. I might have to do this more often.