Dock texture is actually quite nice, but the dock itself could use some better perspective. The water swirls seem a bit strong up front. It could also react better to the dock and her tail, but that is hard to get right anyways.
Everything else is actually really great. I could almost say it's perfect.
Fluttershy's wings actually look a bit over-detailed in comparison, though they are really well done; it makes them stick out too much and draws too much attention away from the main focus.
Overall this is a great piece. I was about to +watch you but realized I already am.