For the first colour grade, I chose a more blue tone in the foreground with some yellow tones in the background to show that the mood depicts the inner emotions felt by the character in the foreground, being sadness. 

For the second colour grade, I was just playing around with red shadows and midtones with yellow/green tints and a slight faded film.

For this colour grade, I went for a more yellow/blue scheme to suit the emotion but I might’ve made it too yellow than blue.