Adding a feeling of depth to a photograph also gives the viewer's mind-and-eye room to "travel" within the frame, adding interest for them.
One of the ways to add depth is simply to make sure you include some of the foreground in the photograph.
It seems obvious once you think about it. But many folks get so focused on their photographic subject, that they forget to provide context for the subject, such as the foreground.
So train your photographic mind to think about the context, as well as the subject.
When trying to project depth in a photograph, you should use a wide depth-of-field to keep the whole scene in focus (larger f/number (smaller aperture), or use landscape mode on a point 'n shoot camera).
© Jerry Weimar Photography