Rule 34 Dev - 1girl 2020s 2023 2d 2d_(artwork) abs anthro anthro_only badass black_bottomwear black_bra black_topwear blue_background blue_body blue_skin bottomwear bra bracelet bracelets breasts dark_background digital_media_(artwork) ear_fins female_abs female_anthro female_only fins fish fish_girl flexing goopy_art hair head_fins long_hair looking_at_viewer marine midriff monster monster_girl muscle muscular muscular_anthro muscular_female no_eyepatch non-mammal_breasts ponytail red_hair red_ponytail sharp_teeth slit_pupils small_pupils smiling solo_anthro solo_female teeth thumbs_down topwear twitter undertale undertale_(series) undyne upper_body very_long_hair video_game_character video_games wristwear yellow_sclera yellow_teeth|1033859