|*Hello from Sid and the Critique Club*
I'm sorry you haven't had any comments, I'll try and make up for it here. First impressions are of an interesting feat captured in an interesting way.
This practice is something very familiar to me, I used to live in a location where there was a 'professional' rock balancer who used to earn a living from rock balancing, displaying to the public and selling images to tourists, so keep it at you never know…!
As regards the image, your long exposure has made the shot a lot more interesting with the motion blur of the water. It would have been much more effective to be able to see the rocks against the water as opposed to the lovely flowing water but then again its the boulders position that gives the flowing water its interesting and lovely flow. If you could have got yourself in a position where there are no background distractions I think it would give it a lot more impact.
In terms of the settings, I always try to avoid using the smallest aperture for better image quality, so if you are using the smallest aperture it would probably be better to use a denser neutral density filter. The exposure is well controlled with good detail throughout. The dry areas of the stones reveal how active the water around them is so in itself it gives it a bit more interest too.
Thank you for submitting and good luck with your future entries, Sid