This is a poster for the musical singing in the rain. The main poster colour scheme is a range of blues. when we think of blue we think of cold as it is a cold colour and i think this works well for the singing in the rain poster.
C that the artist created a mountain range out of different pictures of actual mountain ranges. The different colors make it easier to tell that each overlapping picture is a mountain and keep your eye flowing from one pyramid to the next nicely.