The first two seem like couples. You know when you're walking with someone you love and you want to take a picture because the atmosphere is too romantic.
The light of the setting sun casts the world in a gentle, warm orange glow.
It’s the turning of a page. Like the metaphorically and psychologically important act of going through a portal, but at a much larger scale. We can put the troubles of the day behind us and move on, perhaps even get some rest.
Sometimes a view like this can also make you think deeply about your life which I what is happening with the third one.
He's thinking about the choices he's made in his life. An atmosphere like this can instill positive energies in you.