Hi. First of all this photo fits the challenge, so there's no problems there. The panning technique is one of the hardest to master and it's very difficult to get decent results. I think you've done a good job here. I think the main reason that you didnt get a higher score is that even though the boy is sharp as far as the panning goes, he still looks a little soft. I think this is due to the post processing not the photo-taking. When you scale down a photo to fit DPC sizes, they always become soft. I've found the best way to fix this is to afterwards use Unsharp Mask with these variables:
I tried this on your photo and it sharpens the boy a lot, improving the photo no-end.
I think a slightly different crop would also make it a bit better. Perhaps moving the boy more towards the left of the frame. This would increase the space on the right of him, to make it look like he is riding into the photo. This is a technique used a lot for action, and also for portraits. Looking into the frame is often better than looking out of the frame.
Overall this is a great attempt at the technique, and would look even better with just a little more basic post-processing.
Shows good action. Nice panning shot. I like how well you got him in focus, and the background is nicely blurred. Love the rosy cheeks...looks like he worked hard to help you with this shot. :) ~Heather~
Background really shows speed. The contrast of the subject really pops out of the background. The dark clothes really helps. The blur in the wheels and feet really give that extra touch of speed.