cute mermaid coloring page, friendly cartoon mermaid, simple and elegant design, minimal details, long flowing hair, seashell top, beautiful fish tail, smiling face, isolated character, no background, no sea plants, no fish, no bubbles, no rocks, thin clean outlines, very thin and consistent line thickness, black and white line art, smooth closed contours, all lines fully complete and connected, no open shapes, no broken lines, no shading, no gradients, no grayscale, no sketch lines, large simple shapes, easy for kids to color, centered composition, white background, vector-style line art, closed contours only