A picture of cancer crab 1. **Geometric base**: Start with basic geometric shape

A picture of cancer crab 1. **Geometric base**: Start with basic geometric shapes like circles and squares to structure the overall design of the crab. 2. **Crab silhouette**: Draw the silhouette of the crab using curved and straight lines.. Use triangles and curved lines to form the tweezers, and straight lines for the legs. 3. **Details**: For the finer details like leg joints and antennae, use small straight and curved lines. You can add small circles to represent joints or joints.. 4. **Contour effect**: Keep the design simple and in white lines on a dark background, with the main geometric lines forming the outline of the crab. 5. **Final Touches**: Add a geometric frame like a circle or square to unify the design and give it a technical or blueprint look..