I actually prefer the original to the cropped version.
While I agree that the purple cast looks odd, the two rocks that are in the bottom left corner are (to me) an essential part of the image.
In the uncropped image you can form a curve from the bottom left corner, along the rocks (towards the steps), then out again along the shore to the distant rocks, and on to the setting sun.
My eye then follows the line of light across the water to the middle of the bay, then across and up the steps (which the original curve 'points' towards) to the house.
Take away those two starting rocks, and the whole flow though the image breaks down.