1boy, 1girl, age difference, arms at sides, brother and sister, closed mouth, empty eyes, from side, full body, greyscale, hair ornament, hairclip, height difference, light blush, medium hair, monochrome, multiple views, pleated skirt, profile, reference sheet, ribbon, school uniform, serafuku, shirt, short hair, short sleeves, shorts, siblings, simple background, sketch, skirt, skirt hold, smile, socks, standing, sweatdrop, t-shirt, white background