Rule 34 Dev - 1girl 2010s 2018 2d 2d_(artwork) anthro anthro_only black_tank_top blue_body blue_skin breasts cleavage dark_background deviantart digital_media_(artwork) ear_fins eyepatch female_anthro female_only fins fish fish_girl flexing grin hair head_fins hellonearth-iii long_hair looking_at_viewer marine medium_breasts monster monster_girl muscle muscular muscular_anthro muscular_female non-mammal_breasts ponytail red_eyes red_hair red_ponytail sharp_teeth simple_background slit_pupils solo_anthro solo_female tank_top teeth undertale undertale_(series) undyne video_game_character video_games yellow_sclera yellow_teeth|1060659