The ground is a bit too bright, and a tighter crop (to get rid of the guy standing to the right, he's distracting, would have made my eye not wander so much. The expressions of the girls are fantastic.
Well, he's definitely a clown, and the three happy-looking girls are a nice touch, but the ground's pretty blasted. Adjust your ISO a little bit, I'm almost certain it would've fixed the ground here.
Their poor feet are cut off :( This picture just doesn't work for me. Underexposed foreground and overexposed background. I do love the happy expressions on the kids faces which captures the meaning of being a clown. For that alone you get extra points from me :)
I really love the natural response of the children, also the perspective is great, because it show's 'space' between subject, sort of shows their reticence!