Overlapping for Distance

To show depth in a landscape, try overlapping planes as you come forward.  The darkest and most textured area is around the focal point which is the dock.  The next plane is the profile of the building which I've painted in a grayed blue.  In the far distance, I wanted to give the feeling of sunlight, so I made that plane lighter, but to look sunny, I painted it in warm tones. 
To further emphasize the different planes, I used the masts of the sailboats to overlap the distant shores.  This brings you back up to the foreground.  Also the building on the right keeps your eye up front.
Overlapping three planes will provide a feeling of distance and space.  But be sure to think of ways to look through and around objects in the foreground to keep your eye from resting in the distance.