Cabane a colorier : tortue de mer et récif détaillé

Black-and-white coloring page illustration of: sea turtle reef adult. Audience: adults (relaxation), intricate (mandala-level) detail, realistic detailed 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: sea turtle reef adult. Target search intent (rendered visually, no on-image text): "cabane a colorier" (fr).