Clipping masks allow you to paint freely without worrying about spilling outside a silhouette or shape boundary.
- Place your target raster layer directly above the base shape layer in the Layers panel.
- Right-click the top layer and choose Create Clipping Mask (or press Ctrl + Alt + G).
- The top layer is now visually constrained to the exact outline of the bottom layer. You can paint, adjust colors, or apply textured brushes freely.