I love motion shots, and this is well done. It would be nice to have the horses head really sharp, but this still works well. I like the angle you chose here too. Bumping up.
Was this done in-camera? Nicely executed panning, if so. Kind of scary, actually, that would scare any kid, an angry horse with teeth bared charging at them at high speed... :) I like the colors in the shot, and the way the limited sharpness highlights the subject.
You must live where it is warm, I couldn't imagine riding a carousel this time of the year. Great dynamic photo. I may have been tempted to crop a bit tighter on the head eliminating some othe stuff on the lower right. Just the same, really effective.