Make two copies of the last made layer and select Free Transform option to place the copies the same way shown next picture:

 

Merge Down all three layers containing the white rays (pres Ctrl button to mark out the necessary layers and press CTRL+E options). Select for the new layer this option: Filter>Blur>Motion Blur

 



Select one more option for the same layer: Filter>Blur>Gaussian Blur

 



Use the Pen Tool (P) and Convert Point Tool to draw that part on the ray that would be more voluminous.



The layer’s parameters: Fill 0%
Blending Options>Gradient Overlay



Gradient’s parameters:





Make two copies of the last made layer and select Free Transform option to situate the copies above those two rays.



The picture is finished!

View full size here.