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1:1 2020 5_fingers abs animal_humanoid aquatic aquatic_humanoid athletic big_breasts boots breasts butt clothing crouching eye_patch eyelashes eyewear female fingers fish fish_humanoid footwear frill_(anatomy)front_view genitals greyscale hair head_crest head_frill hi_res humanoid looking_at_viewer low-angle_view monochrome mostly_nude muscular muscular_female nails navel nipples open_mouth ponpuramu ponytail sharp_teeth shoes smile solo spread_legs spreading teeth tongue undertale undertale_(series)undyne vulva