Smirk is a collection of Geometry Nodes designed to create detached facial features, separating the head mesh from the mouth to allow free movement independent of topology. This approach is suited for simple, cartoony characters and includes a Transparency Boolean node group.

The system features Grease Pencil support, enabling you to draw on the surface of a character's head to drive material transparency. This effectively cuts out the drawn area, allowing you to animate 3D mouths frame-by-frame or create eye sockets.