Textural Contrast, smooth against spikes
Lovely example of contrast in color, with the silhouette of the fingers being clearly visible against a dark colored tree.
I am sure this is self-explanatory what kind of contrast this is :)
The below two images show 'affinity / similarity' in the tonal composition. This usually helps in reflecting the mood of the scene, it can be pleasant, dark, sinister, suspicious etc. At times, even a choice of a particular color / tone can mean the occurrence of an event, action or can be used to convey a particular trait in the film. For ex - every time the color blue appeared in the overall composition of the movie 'Murder on the Orient Express', it would mean that a murder is about to take place.