Facesitting looks simple and is hard to film well. The camera has to show the person sitting and the person below without one of them disappearing out of frame.
Angle
The best clips combine a side view for the full scene with a POV view from below. Single-angle clips work if the camera is placed low and close.
Control
Good clips show the dominant partner in control – shifting weight, giving breaks, talking. Viewers notice when a scene is rushed.
Fart and ass worship
Many facesitting clips move into fart domination or ass worship. Both have their own rows on the front page.