Coloring Online: children coloring book page, medium detail, clean black and white line art, bold thick outlines, smooth vector-style lines, no shading, no color, no gray, simple clear shapes, detective wearing coat and hat holding a notebook, smiling children playing outside a school building, teacher standing in doorway waving, balloons floating, simple kid drawings on wall, minimal background clutter, centered composition, A4 page, kid-friendly illustration --style raw --v 6 --ar 3:4 --no shading --no color --no gradients --no textures