He navigated to the Art Texture library. He selected a "cellular" pattern, scaling it down until it mimicked the layered look of flight feathers.
He selected a 3D Roughing toolpath with a 1/4" ball nose end mill. This would strip away the bulk of the wood, leaving a "stair-step" version of his art. Mastercam X2 Art Tutorial
Using the Art Create Shape tool, he selected the hawk’s silhouette. He navigated to the Art Texture library
With a digital "Sculpting" tool, he manually smoothed the transition where the hawk’s talons gripped the knot, ensuring there were no jagged edges that would snap a physical drill bit. Phase 3: The Path to Reality Mastercam X2 Art Tutorial