I do not think that a landscape per se has emotion. A certain scape can invoke
an emotion in a person. Emotion is a characteristic of living things.
Emotions can be invoked for example by a burnt tree in a forest. a dead animal in a desert. colors, as they are associated with emotion. green for youth, vibrancy, life. etc.
I tend to think of human emotions and try to place something in the landscape
that would evoke that emotion.
I hope all this makes sense.