Adam, here's my two cents.
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Change the sky background to a bright blue that somewhat matches the pool water. The pool water would indicate a clear sky with a blue that is nearly equal to the sky.
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Remove the flock of egrets. They look a little busy.
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Figures could be replaced. The man's legs seems to be fading and the woman looks a bit flat and showing too much leg.
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The glass effect at the turret doesn't match the rest of the house. The lower sliding door is also showing a grass reflection. Might want to add one step at the bottom of this door.
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Use a greener grass for the field in the background.