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Add a new layer between whale and shadow layer, we're gonna add more shadows in this layer. Ctrl+Click on the layer whale thumbnail to load a selection, then go to Edit > Fill menu. Inside the Fill dialog, choose 100% Black and then click OK to fill the selection. You won't see the result since it covered by the whale layer.
Rotate whale's shadow to left, erase unwanted parts using hard round Eraser tool with 100% Opacity.
Change the blend mode to Soft Light and reduce the Opacity to 75%. As usual, keep organize by grouping the whale-related layers into one folder.
Open shark image, create selection for the shark ( I'm using Pen tool to do it ). As usual, copy-paste the selected shark into our working document.
Place shark layer between 'inside' and 'left' group. Change the blend mode to Luminosity and adjust shark size and position like shown in the below image.
Go to Image > Adjustment > Shadows/Hightlights menu, adjust shadows amount to 50% then click OK to apply. Shark image will be much brighter then before.
Create a new layer below shark layer, we call it 'shadows' because shark's shadow will be drawn here. Load shark selection by Ctrl+Clicking the shark layer thumbnail. Press Shift+F5 to bring up the Fill dialog and choose50% gray to fill the selection.
Change blend mode to Multiply and reduce Opacity to 75%. Use Filter > Blur > Gaussian Blur with radius: 5pxto blur the shadows. After that, use Edit > Transform > Distort command to adjust shadow size and distortion.
Go back to shark layer, blur certain parts of the shark using Blur tool with 50% strength, faking the depth of field effect.
Still in the same layer, press Ctrl+Shift+U to desaturate shark's color. We also need to fake the lens distortion effect, first thing to do is create a selection in the tail area using Rectangular Marquee tool. Second, activate the Move tool and then nudge the selected area by pressing the Up Arrow several times. Deselect by pressing Ctrl+D.
Open the second iceberg stock. As usual, create a selection around the iceberg (Magnetic Lasso tool is quite good enough). Copy-paste the selected iceberg into our working document.