Overcast day? Some parts of photo looks cold (i don't know, how to say it - English is not the best side of my... :( --- I prefer picture without that small boy at right. How you think, about croping it or cloning out? --- All other in photo looks very good - strong good mood, stroong expresion, good point of view, great DOF.
You have captured a wonderful moment..... what a wonderful feeling expressed... and two more children in the background! Congratulations, this is a great shot.