First of all kids do not comply with the wishes of photographers so you had better be at the ready and get the shot while the getting is good.
I have examined the photos and have found that you nailed composition dead center a bulls eye. The only real question here in my mind is how well did you set the stage in terms of you being ready technically? The reults are basically faultless in terms of emotion, action, spirit. ie. composition. So what about the preset technical matters of exposure settings focus, flash etc? My answer is that I don't care to even speculate because there are just fine to me and I don't need to pick them apart for improvement. Well done.