Masterpiece, (assemblage), (collage), conceptual art, flat design, Complicated formulas, mysterious sequences of numbers, difficult figures, neatly written, lineart, pastel colors, A girl at her desk with a serious expression on her face. She has a pen in her hand and is working hard to write equations in her notebook. , young girl, beautiful face and eyes, big breasts, black hair, clear black eyes, single short ponytail hair, cute and lovely, Vigorous, lively, Short-sleeved white collared mandarin shirt, black necktie between breasts, black pleated skirt, white socks, loafers