Those are some really nice shots. Two considerations you might want to ponder, and I offer them without taking anything away from the shots you're displaying here because those really are well done.
1. Move your subject off center. In all of the above shots you have a really strong, clearly defined subject, which is critical. The perfect centering however, detracts somewhat from the vibrancy *OF* that dynamic. Your shots could go from "Nice shot!" to "WOW!!" with just a tweak in the framing.
2. You've used a slow shutter speed to capture the dynamic of motion and gotten some really good exposure and focus is spot on. The first and third shot sort of stand out for me, though, in that lines and elements are created instead of just a blur of solid color. Personally, I think this adds real punch to those shots in particular. They're *all* good shots, as I said, but I think there are definitely some things you're doing right in those two in particular.
Actually now that I look at them more closely, I'm seeing more of those elements I like so much in some of the other shots as well... I think my brain is still waking up over here.
,....