Interesting image, but it either looks like long or multiple exposures, not motion panning (the backround is light, but not exactly blurred). As an image (challenge aside), I like the color of the bicycle, but that seems to be the main focus. I can't find anything else to really focus on or that draws my eye; if something in the image had been the clear subject, it would have been easier for me to take, I think.
Not quite there yet.... in my opinion, a successful motion panning photo has at least SOME of the subject in clear focus, whilst the background shows the tell-tale streaks.
The image's potential for impact is lost on the complete lack of stop motion. Too long an exposure gave the subject ample time to move and not be stopped in action.
Humm...not motion panning IMO. This is more like a long exposure or a slower shutter speed with a flash synced at the rear. Nice effort but better luck next time.