First impression - I wish I had a little for to focus on.
The eyes don't really have a place to go. I'm not talking about focus in the sharpness since. The top most flower is where my eyes goes naturally, but it is too close to the top and doesn't bring me back to the rest of the image.
Also there isn't any context to the motion. Not that there has to be, but I don't know why the flowers are moving.
Technically - The choice of colors and lighting are excellent! The black background works very well. The motion blur has a nice linear fell to it. The exposure looks just right.
If this shot had something more than motion for motion's sake, I think it would have done much better.
I hope this was helpful. Feel free to contact me if you have any questions.
I've given the same basic comment on quite a few shots -- my preference (as I discovered while looking at a number of these blur shots) is for a sharp subject. When there is no sharp subject, my eye wanders around trying to find something to focus on. Perhaps just a difference in artistic preference.