Colours
A polarizing filter will give all colours a boost , not just primary hues. In this case , the effect is subtle but the filter has added punch , making the foliage appear more lush and enhancing the greens and browns on the stones.
Shutter Speed
Polarizers reduce the amount of light entering your camera , which makes for longer shutter speeds. This can be a problem , but in this particular instance the longer speed has a pictorial benefit , adding extra blur to the water.
Reflections
Glare for non-metallic surfaces is ubstantially reduced by a polarizer. In addition to reducing distracting highlights this also ensures you get more detail in key parts of your images, particularly those that include water
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