I very much agree with the previous comments on this one, Maria. There just isn't the time or opportunity to get a perfect composition in this type of shot, is there.
And know what you mean about the photographing kids thing.
I manage an under11 football team and feel very awkward whenever I take a photo, even though it's with parents' permission etc.
I think the red/grey contrast is good and the scattering pigeons/motion blur of the child's feet gives impact.
I certainly feel that the suggested cloning will improve the image although I like the actual composition anyway.
As to cloning, it's like all things - the more you practise...