In order to take this kind of photo, find a time you believe is perfect to express your current mood status.
Take myself for example, the sun was slowly setting in the later afternoon. I had just come back from a long day at school. This was a perfect way to picture my mood at the time: tired and wanting to just relax. As I laid in the shining sun from the windows, my camera snaps from a distance as I rest my eyes in a peaceful sleep.