rule 34 2010 anthro balls biped black eyes black fur black hair black penis black stripes black tail equine eyebrows fur gloves marking hair holding object long tail looking at viewer male male only mammal marker artwork markings mixed media multicolored fur nipples nude pencil artwork penis pink nipples portrait simple background snout solo standing striped fur stripes stripes character tabibito three quarter portrait towel traditional media artwork two tone fur white background white balls white fur zebra 2450635