2 Add some motion blur

With the middle layer still active, go to Filter > Blur > Motion Blur; in the resulting dialog box, set Angle to 0 and Amount to around 230 pixels. (You may want to vary this, depending on the content of your image.) Click OK, then click on the top layer to make it active, and switch on the ‘eye’ icon so that you can see the changes as you apply them.

Set this layer’s Blending Mode to Soft Light and again, go to Filter > Blur > Motion Blur. This time, set Angle to 90 degrees so you get Vertical Blur on this layer, rather than horizontal. Now press Ctrl/Cmd+T to enter Free Transform; enlarge this layer a bit more than you did the last one, and rotate it a little in the opposite direction. Press Return when you’re happy.