Action films are her preferred genre, as she thinks, to some extent, they present the intrinsic style of Hong Kong films. "There are many excellent Hong Kong action films and local action film directors, and I like the exhilaration of the fight scenes and gunfights," she says.

However, taking the pictures is always a challenge. "For example, when snapping a fight scene, there might be three handheld cameras following the actors to capture different angles, and I have to keep moving to not interfere with either the camera operators or the actors, while still trying to capture the essence of scene," she explains.

When taking photos of explosions, Tsang always finds out how the explosion is set up and where the blast is aimed in order to not only keep herself safe, but also to work out the best angle to shoot from.

"It's also dangerous to shoot drag racing scenes, because you never know what might suddenly fly toward you," she says.

"The angle to shoot a drag racing scene is crucial, as when you shoot right in front of the car, the audience may not feel the sense of distance, so you must find an angle and compose of the photo in a way that illustrates the distance and speed of the cars," Tsang says.

Gunfights are also challenging, but rewarding, she notes. There is great deal of difference between speed of the shutter and a gunshot, so whenever she captures the muzzle flash of the gun, she is so happy.

"When we shoot action films, the crew members and the actors are like dancers. It's all tightly choreographed as we all move around together," she says.

On the film set, Tsang takes pictures only when she thinks the composition and the lighting is right."These still photos can be a good material for the movie's poster," she explains.

"When I am on set, I do not think too much, as soon as I see a beautiful, or worthy shot, I will press the shutter," she says.

2017 Hong Kong action crime thriller film The Brink was the first film for which Tsang created a poster.

The film centers around the heist of an underwater vault full of gold belonging to a gangland boss, so Tsang added stormy, marine elements into the poster.