1girl, bocchi_the_rock!, breasts, cleavage, crop_top, cube_hair_ornament, electric_guitar, gotoh_hitori, guitar, hair_ornament, hews, holding, holding_instrument, instrument, long_hair, looking_at_viewer, medium_breasts, midriff, monochrome, navel, panties, sketch, solo, stomach, sweat, thighs, underwear, unfinished