rule 34 animal genitalia anthro arm markings balls black claws black markings canid chest markings claws closed smile color swatch ear piercing ear ring erection facial markings front view full length portrait fur genitals glistening glistening eyes green eyes grey body grey fur head markings hi res knot male mammal markings model sheet mouth closed nipples nude pawpads penis piercing portrait red nipples red pawpads red penis ring piercing roobin sheath signature simple background solo standing white balls white body white fur white sheath 7416603