Into the Dark
Jesús arrives at De la Guardia's factory and del Toro composes a shot with the large entry way framing him as he enters. There is only external light which makes the inside of the factory very dark. The imagery shows that Jesús is walking into the darkness of this man's plot.
Aurora
Jesús, before entering Aurora's play room on the roof is seen in a composition with the red door, a red couch to the right of frame and a sheet blowing in the wind to the left of frame. The imagery reveals thematically what this scene is all about: the cronos is after blood. Aurora knows it and Jesús knows it and the red in the imagery reveals it.
Transformation
After Jesús is bitten by the cronos we see him begin to change. At first he becomes younger, more lively. But, after his death and reawakening his skin begins to peel until at the end of the film he is completely transformed into a marble-white skinned monster. The imagery shows how his transformation didn't come naturally, his deathly look only came once men began to persecute him, Angel killing him and De la Guardia commanding him to tear his skin away. It shows that it is men who make monsters of one another.
