The second kid in the background is distracting and it would work much better as a photo of just the one kid somersaulting. No sharp point of focus makes the eyes wander without locking onto a subject
well...its not directly giving the message...when anyone look at this image without caption, he will not be able to get it..although composition is nice...
The expression and movement do represent "Yippee" but the figure behind the subject was confusing to me at first, as it almost looked like a wrestling match or something. I would like this more if the second figure wasn't in the frame. The motion adds to this, but it seems there is camera shake as well, which doesn't add to it.
Looks like they are having fun, and it's a great family snapshot, but I'm afraid a snapshot is what it does come off as. (I've got plenty of my own like it!)
Fun motion shot! It seems way oversharpened though. The blur is fun and you might try playing it up to add to the motion of the photograph instead of trying to sharpen it away.