It's too small and it's very hard to see what's going on. Your pictures can be up to 640 pixels on the longest side. A larger version would be much better. Looks like you've stopped the motion well. Get him to wear lighter trousers next time.
Would like a bigger picture. Details are difficult to see. The lighting off the guys back and white shoe help to bring him out of the shot. The darker background helps too, but the black pants blends in with the background a bit. Maybe if he was wearing all white he would stand out even more.
I see this as right on for the challenge. I also see poor composition. His foot is right in front of her face. I of course don't know what conditions you had to deal with to obtain the photo. Nice effort.