Wow, what a nice picture. I love the green of the moss on the rocks and the white of the water.
Only constructive suggestions I have to offer are to consider cropping the photo to remove the upper-right corner, as it takes away from the beauty of the waterfall, and to maybe consider photographing using a slightly slower shutter speed, to give the water a more mist-like look (that's not to say it doesn't look great as it is...it's just what jumped into my head).