Today's lesson will be making top River shot. I will follow show you how PS effects can be used.

Create new document:

Wave systems

So create a new Doc and a layer in FILES menu.
Add a gradient like this one:

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Plus another gradient.

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I've also decoded o put an effect ?> Filters>Distort>Wave. You can play with wave value as you like.

Use quick mask. Wanted to detail the center Blue wave. So press (q) a begin painting the areas with the brush.

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These changes to a selection (tap q Once more to turn off Quick mask).

Wave systems