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Transform the sand texture using Edit > Transform > Distort command, making the perspective view like shown below. Don't forget to press Enter when you're done transforming.
Next, make this layer as a clipping mask layer by pressing Alt+Ctrl+G then change the blend mode to Linear Light. This step also finish the 'adding texture-part' of this tutorial.
Create a new clipping mask layer between sand texture and 'bottom' layer, change the blend mode to Overlay then draw shadows using soft round Brush with low opacity. When using Brush tool, remember the light source we mention at the beginning as your reference where to put shadows.
Repeat creating shadows for each shape layers. But don't change the blending mode, leave it normal instead. See image below if you need guidance.
Get back to sand texture layer, we need to sharpen it a bit by using Filter > Sharpen > Unsharp Mask menu. Inside the Unsharp Mask dialog, adjust Amount and Radius value as seen below. Click OK to apply the filter.
I think we need to sharpen the top most wave layer to make it more convincing as real sea wave. Select the wave layer and repeat the Unsharp Mask filter, by simply pressing Ctrl+F. We need to tweak the wave color balance since I think more darker blue is better. To do that, we're using Hue/Saturation ( press Ctrl+U ) and Levels ( press Ctrl+L ) command.
Select layer shape 'bottom', add a layer mask in this layer. Then using soft round Brush tool with low opacity, mask the shape's edge ( the upper-right parts ). As you can see, the result does imitate 'depth of field' when you look something underwater.
To keep organize, put related layers inside a group/folder. This will bring out four different group which is named 'top', 'inside', 'left' and 'bottom'. If you using Photoshop CS3 or the later version, you can do this step easily by Ctrl+Clicking related layers then press Ctrl+G.
Open the cruise image. Grab Pen tool from tool bar, then start creating selection path to isolate the cruise.