The screenshot alone adds a lot of suspense because it looks as if he's going to knock on the door or open it.
It's cool how the light is kind of blocked by his arm and it makes a shadow.
It's interesting how it doesn't show who's arm it is which also adds suspense.
It is a low angle shot and a close up.
During this scene, John Anderton is going to Leon crowes room and plans on not killing him but ends up doing it anyway.