Giving a picture some Depth.

In this picture I wanted to add some depth to the picture.

I started by duplicating the layer.
After I had duplicated the new layer I used to Gaussian blur filter on the bottom layer.
(adjust to your liking).

On the duplicated layer I added a mask.
In that mask I filled it with a black to white gradient fill.
While in the mask you could use the paint brush to touch up .
(when you paint on black the image disappears and when -
you paint on white the image returns)

And here is the final result .
Here is another example

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