I always enjoy action shots because they are sometimes so difficult to get. You have good color and excellent composition in this shot. I really like how the subject matter fills the frame with no extraneous material to get in the way.
This image certainly fits the challenge, but didn't get a really great score.
The one thing I would suggest is to make something in your image tack-sharp. As it is, everything is just a bit fuzzy. The motion blur on grandpa's legs works perfectly, but the sled and/or the snow should be really sharp. One way to accomplish this - with that nice camera of yours - is to shoot in burst mode; one or more of the resulting images is likely to be sharp. (at least it works for me.LOL)Another way to try for sharpness is to bracket your shots.
You have a good sense of composition in this and your other shots. A little more practice, and you'll be up there with the best of 'em.
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