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absurd_res anthro balls claws digital_drawing_(artwork)digital_media_(artwork)feet foreskin full-length_portrait genitals guide_lines half-erect hand_feet haplorhine hi_res male mammal mandrill monkey monochrome nehocane old_world_monkey open_mouth partially_retracted_foreskin penis portrait prehensile_feet primate sketch solo stretching teeth toe_claws toes unfinished yawn