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2021 anthro arm_under_breasts avian beak biped bird blue_body bluebird breasts butt colored colored_sketch feathers featureless_breasts featureless_crotch feet female grey_background guide_lines hi_res looking_at_viewer markings mountain_bluebird navel non-mammal_breasts non-mammal_navel nude nude_anthro nude_female oscine passerine shadow simple_background sitting sketch solo spread_legs spreading stoneheron tail tail_feathers talons three-quarter_view thrush_(bird)toes white_markings winged_arms wings