Convert the reference image to a modern graphic editing illustration: retain the original character's clothing, simplify the face, create a slender and soft proportion, place it in a clean geometric room, use large horizontal and vertical color blocks derived from the reference image to form the picture, matte watercolor+light paper texture, calm and contemplative atmosphere, comfortable negative space layout, no black borders, no realism, no 3D, no cluttered elements, balanced composition, harmonious colors