First impressions: Water has a nice silky feel without really blowing out any of it.
Composition: The position of the rocks and the tree on the left are the strongest parts of the composition. Though there is one branch from the left and a sapling on the right of the frame that are a bit distracting since they are blocking the view to the water.
Exposure: This looks like a tough lighting situation. I think the silky feel of the water is what you were going for so in that regard the exposure seems right with only a couple of spots that look blown out. However other parts of the image seem underexposed.
Post processing may help bring out detail in the shadows a bit more.
Impact: Some impact is present from the feel of the water. For more impact, framing the water a bit better with the trees and bringing out more detail in the shadows I think would help.
Creating these kinds of effects in running water is always fun. Keep experimenting and have fun.
The foreground is a bit too busy. Rapids with a slow shutter can be very pretty, but this does not do them justice. All this imo, obviously. Good luck!
With a better vantage point and stronger composition (always try to work with leading lines in a landscape), you might have had something here. This isn't a bad photo, but it's just not very interesting either.
I think the branches in front of the river distract a bit, but it looks like you've got the hang of the technique to get the river looking nice and smoothe :)