when I was doing research about motion blur, a book suggested that you shoot with a busy background so the blur can be seen. Here, it is hard to get a good read on the speed because there is no contrast in the background. Also, it is sort of standard to have more negative space in front of a subject's implied line of motion. In other words, the motorcycle should be driving into empty space rather than off the frame. That is a classical rule. (don't have to follow it of course,)
Good work. 6
This shot could be helped by a different background that would show off more of a blur, also the composition would be better is bike was on left riding into the shot instead of on the right riding out of the shot.