Step 3
Layers > New Raster Layer... > Ok
Now the magic. This is the part that gives it the really nice looking inner glow.
On the Materials palette, click on the Foreground color. It should already be on the Gradient tab.
Click on the image to open the available gradients.
Select Fading white and use the following settings:

On the Tools toolbar, select the Flood Fill Tool (F) and fill the selection:

We only want this extra highlight on the bottom of the image, so lets remove all of the excess.
Selections > Edit Selection
On the Tools toolbar, select the Move Tool (M) 
Using the arrow keys on your keyboard, move the selection up three pixels:

Take the selection out of edit mode.
Selections > Edit Selection
Now, hit Delete on your keyboard
Selections > Select None
Your image should now look similar to this:

Layers > New Raster Layer... > Ok
Selections > Load/Save Selection > Load Selection From Alpha Channel... > Load.
Selections > Modify > Contract... > Number of pixels: 20 > Ok.

Alright. So far so good. What we want to do now is move this selection up towards the top of the image.
On the Tools toolbar, select the Selection Tool (S) 
While holding down on your right mouse button, grab the selection and move along the top of the image:

On the Materials palette, click on the Foreground color. It should already be on the Gradient tab.
Modify the previous Fading white gradient settings to the following:

On the Tools toolbar, select the Flood Fill Tool (F) and fill the selection
Selections > Select None
Your image should now look similar to this:

This is looking really nice, but let's knock off just a bit of the shine appearance so that it blends better with the rest of the image.
On the Layers palette, the Raster 5 layer should already be highlighted. Lower the layers Opacity down to around 71:

Now let's finish this image up by placing what we've created so far into a group.
On the Layers palette, select the Raster 1 layer
Layer > New Layer Group... > OK
Drag the other layers into the group. Remember to keep them in the same order when you move them. When you're finished it should look similar to this:

Your final image should now look similar to this:

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