If you look at the twig sticking up from the log, just to the right from the end of the twig, there is a rock that looks like a duck if you look at it just right.
QUACK! I think it's two rocks that make it. the closer one forming the body and the further out one for the head (the moss covered one).
If it were me, I would've rock hopped to remove that same twig that Patrick mentioned as well as the one in the middle far left.
As for your photo, the water movement is okay, but another 1/2s would have given a more coton candy look to it. But that would also affect your exposure badly, so other adjustments would be needed. It also looks like you shot this at a bright time of the day. Unless you have an ND filter, try this again some time either earlier or later in the day. While you're at it the next time, try another PoV, such as the water coming right towards you like thisor thisfor example.