Mandalas de pinguinos estilo camiones de construcción

Black-and-white coloring page illustration of: construction trucks kids. Audience: adult intricate detail, intricate (mandala-level) 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: construction trucks kids. Target search intent (rendered visually, no on-image text): "mandalas de pinguinos" (es).