colored it a bit brownish color and applied dodge and burn tool and filled the mouth of it with black color.
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using pen tool created these shapes and filled it with colors..
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step 7 of 11
Applied dodge and burn tool to create highlights and shadows of the water flowing..
step 8 of 11
using default brushes of photoshop I started creating a texture of my own.. the trick was just one 'trial and error'.
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continue making texture
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step 11 of 11
finally I created this texture, which suited my need. After creating this texture I changed the blending mode of this layer to 'Overlay' and got the final result.