Then use the select color range tool and select the blackest parts of the image.

FX Layer illustration



FX Layer illustration



FX Layer illustration

Use once again layer via copy command and copy to separate layer + transform it (ctrl+t).

FX Layer illustration

Here is the position of our layer:

FX Layer illustration
  


I've used a little bit of Gaussian blur on it (remember to select the whole layer first).

I used some layer styles on it.

FX Layer illustration



FX Layer illustration



FX Layer illustration

And here is my current result:

FX Layer illustration