Create the Third Dimension
Photography is a two-dimensional medium, so we sometimes need to try and create a third dimension – especially in landscapes – to give depth to an image.
Try using strong foreground interest, or utilize lines within a shot to draw the viewer in: a road, a fence or a curve of beach can work.
Shooting from a higher vantage point is sometimes a good way to get better depth in a shot. I often take shots from the top of my car, or standing on my camera case.