I really like this. Nice and bright, and the shadows are correctly exposed, I would say removing the grain would be beneficial, though I don't think it detracts too much, other than washing out the vibrant colors slightly.
My only suggestion would be to get down a bit lower to include the top of the reflection. Forgive me if I'm wrong but it appears you had to clone something out in the bottom left corner? I find the hardest part of getting a nice refection shot is getting close enough to the water to eliminate all foreground distractions, often its easier to find a pleasing way to include it if possible.