The long exposure obviously gives motion blur in the sky and water. The static elements should be sharp. The subject will change so color, time of day, time of year, traffic on the river and so forth are what basically will make your picture - not removing the carousel or other parts of reality and not you CS5 capabilities. My 2C of course. I think you did well.
Hi you can the MkI version mich cheaper on Ebay than 400. Actually I have one for sale at 300, but that's another story. I do agree with the other reply that the ring flash doesn't produce the best lighting.