To create a sense of scale and to add depth to our images we have to use compositional elements within the frame that when put together, give the photos perspective. What the elements are, how close they are to the position you're shooting from and how they differ in size to each other will all change how your shot looks and feels.
By adding an object which the viewer will have a good understanding of how tall it is, such as a person, it'll be much easier for them to grasp how large the other object is, giving the shot scale and more importantly, impact.
We said use a person as it's a familiar shape that people can relate with but you can use trees, rocks, buildings and if you're up in the mountains, its own ridge placed in the foreground of the shot can help give your image scale and the ridge can also be used to lead the eye through the shot.
Landscapes aren't the only subject where people and other objects can be used to add scale to a shot as photos of architecture, inside and out, work well when there's something of a recognisable size in them.
Try not to position your subject too close to the camera as they'll appear larger then they actually are when compared to the scene around them and the sense of scale you're trying to create won't be accurate. Move them quite some distance from the lens, say for a wide shot of a landscape with fields full of flowers that stretch for miles or a shot of desert dunes, they'll take up much less of your shot and it'll really exaggerate the sheer size of the landscape you're working in.