rule 34 2017 all fours anatomically correct anatomically correct anus anthro anus ass backsack balls biceps biped black anus black balls blush bridle butt focus cyrus jorgensen digital media artwork draft equid equine eyebrows fake antlers fur genitals gradient background grey eyebrows grey hair grey tail hair hi res looking at viewer looking back male male only mammal marloncores muscular muscular anthro muscular male nude orange eyes perineum presenting presenting hindquarters puffy anus rear view reins signature simple background snout solo thick eyebrows unseen character white body white fur 3934889