1girl argon_(argon18) arm_scrunchie bare_shoulders blue_eyes blue_ribbon bracelet breasts choker cleavage closed_mouth collarbone dress frilled_choker frills gloves hair_ribbon idolmaster idolmaster_cinderella_girls idolmaster_cinderella_girls_starlight_stage idolmaster_dearly_stars index_finger_raised jewelry looking_at_viewer medium_breasts mizutani_eri necklace pearl_bracelet pearl_necklace ribbon short_hair simple_background smile solo starry_sky_bright_(idolmaster) strapless strapless_dress tiara upper_body white_background white_choker white_dress white_gloves