Instead of giving your images a perfect "glass-table"-reflection, give them a blurry water-reflection, which you can use to recreate rivers or things that are above water-level.
Water Reflection
Add realism to a photo by adding a water-reflection.
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Step 1 Get a FULL image of someone or something;

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Step 2 Duplicate the image and place it, vertically flipped, UNDER the image;

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Step 3 Go to Filter>Disort>Ocean Ripple and set it to these options;

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Step 4 Now it should look like this;

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Step 5 Go to Filter>Blur>Motion Blur and set it to these options;

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Step 6 And you can also add some perspective if you want...
I didn't do it.
