When we look at a scene we tend to seek out details with our eyes and we manage to ignore uninteresting areas.
However, dull, featureless foregrounds act like a barrier in an image, they make it feel like you’re too far away from the point of interest.
This situation can be quite easily rectified by including something of interest in the foreground.
This might be a patch of flowers, a few boulders or shells on a beach, for example, and it works especially well when this interest leads off towards the main view.
The idea is to have something of interest in the near, middle and far distance of the image.