Dessin gratuit mandala sirène sous la mer à colorier

Black-and-white coloring page illustration of: mermaid under sea kids. Audience: kids 2-5 (chunky lines), moderate detail, art nouveau drawing style. Pure black outlines on white background, no shading, no fill, no grayscale, no gradient. Closed shapes ready for crayon / marker. Clean printable line-art at high contrast, no watermarks. Wholesome family-friendly imagery only. No graphic content, no scary or violent themes for kids audiences. Specifically: mermaid under sea kids. Target search intent (rendered visually, no on-image text): "dessin gratuit mandala" (fr).