Sa landscapes, color casts make photos look unreal. If the green color cast is intentional, always use the original colors of the scene. For instance, no one has ever seen a beach with green sands yet.
Another side of the story might be a miscalibrated monitor. If you see the colors on your monitor to be correct (creamy white sand) then you'll have to double check your monitor's color calibration.
Composition-wise, the photo looks like it was taken by an experienced travel photographer so good job on that and I hope you keep it up. Try going further by using tripods and filters and even remote triggers with very long exposure times.
Namiss ko tuloy ulit magbeach :)
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-- edited by bloode_13 on May 22 2015, 10:59 AM