Before and After

Step 1
Now you’ll be needed the Pen Tool (V) which looks like this:

Set your settings as mine:

Make sure your color palette looks like:

Step 2
Now carefully from the top use the Pen Tool to slowly go in a spiral motion down the image. Mine looks like this so far:

Step 3
Now go to Effects >> 3D Effects >> Drop Shadow and set your settings as mine. Repeat this step so you will have done this twice.

Step 4
Now take the Eraser Tool (X) and erase every other spiral to get an effect like the “after” picture at the beginning of the tutorial.