13. Here's how mine looks like so far.
Note. Effects may vary. And if the gradient doesn't match up with the folds then simple select the 'Direct Selection Tool' again and select an individual anchor point and hit the arrow keys to nudge in the proper direction. Repeat for any other misaligned anchor point.

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15. Next, add an image on a new layer above the 'book' shape layers. Hit the 'Ctrl+ T' to transform/ right-click and choose 'Distort' and position it as you did with the 'book' shape layers earlier. Except, leave an overlapping edge.



From this capture this is what I mean by overlapping.

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16. Now, select that new layer in the ' Layers Palette'.

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17. Then hit 'Ctrl + G' to group with previous layer. There's a new clipping group arrow icon in the 'Layers Palette'.

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18. This is how the image looks thus far. The overlapping area was literally clipped and now the gradient effect is showing through.
The image still appears flat and needs to be adjusted to the folds in the magazine. For this we'll use the 'Liquify Tool'.

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<!-- 19. Then rotate the photo layer to its original state and use 'Ctrl+T' /'Distort' to position the photo down to size that your most comfortable with.

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--> 19. With the image layer still active, 'Shift +Ctrl +X' to activate the 'Liquify Tool'.

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20. Click here for the 'Liquify' Instruction.

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22. This is how it looks so far.

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23. To bring back some of the color that was lost in the clipping group process, I duplicated the image layer 2 more times as I have captured below. (Screen Mode at Opacity of 43% and a Multiply Mode of 100%)

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Here's the enhanced color version.

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24. Here's the final result. Added a few addition white shades with simple brush/blur combination at reduced opacity a drop shadow to the whole image and a center fold line.