nakatanbo, hatsune miku, monochro blue sky (vocaloid), vocaloid, black legwear, red neckwear, artist request, bad id, bad pixiv id, 1girl, absurdly long hair, anniversary, aqua eyes, aqua hair, artist name, bare legs, birthday, black hair, black shirt, black shoes, blue eyes, blue hair, blue skirt, blue sky, breasts, cloud, collared shirt, day, female focus, full body, happy birthday, holding, holding notebook, holding paintbrush, long hair, long sleeves, matching hair/eyes, miniskirt, notebook, outdoors, paintbrush, parted lips, plaid clothes, plaid skirt, pleated, pleated skirt, school uniform, shirt, shoes, skirt, sky, small breasts, smile, solo, twintails, upside-down, very long hair