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Still in the same layer, go to Edit > Transform > Warp then warp the image following the 3D model side curve. See image below for more details.
Duplicate the wave copy layer, then place each image on top of left and right layer. After that, make each one of them ( wave copy layer ) as a layer clipping mask. Result of this steps can be seen in the image below.
Select the wave copy 2 layer (the one on top of right shape layer) then change the blend mode to Multiply. Make it blur by going to Filter > Blur > Gaussian Blur menu, adjust Radius value to 5px then click OK.
Repeat previous step for the other wave image placed on top of left shape layer. To apply the same Gaussian Blur filter, simply press Ctrl+F. When you're done, select the left shape layer's and reduce the opacity to 70%. This will make the left shape become transparent.
Go back to right shape layer's, we need to tweak this layer so it look transparent as the left shape. Reducing the layer opacity will simply work, but I didn't want the entire right shape became transparent. So I decide to add a layer mask, then use a black-soft round-Brush tool with low opacity (around 10-20%) to mask some areas so the transparency is applied only on certain parts (i assume you already knew how to do masking with brush tool).
Copy-paste the water texture image once again, don't forget to decrease its size. Make sure you place this new water texture layer on top of inside's shape layer, then create a selection using Rectangular marquee tool. Now Inverse (press Shift+Ctrl+I) the selection, delete the selected area then deselect ( press Ctrl+D ). Still in the same layer, make it as clipping mask (press Ctrl+Alt+G) and then go to Edit > Transform > Distort. Distort the water texture until it the perspective's feel right. Press Enter when you're done.
Same as previous step, change layer blend mode to Multiply then apply Gaussian Blur filter. Later on, reduce the "inside" shape layer opacity to 70%.
Open and copy-paste the sand texture image into our working document. Place it on top of 'bottom' shape layer then decrease its size using the free transform command.