Cute shot, very hot colors. Did you have the camera set to vivid?
Outch - everything looks like a bad postcard. It looks like your saturation is turned up high and your contrast is too. John's comment on the Vivid setting makes sense. You can sometimes get away with some of those funky settings, but not where there are people in the shot.
Let's not forget the really great composition including the overall positioning of the children and each of their poses. Really great!
In addition to the comments already mentioned, the image seems to have a strong magenta color cast. My guess is that that's a result of your post-processing rather than your camera settings, but I could be wrong. The horizon also seems to be quite tilted.
Victor, I personally think you did a great job capturing the girls' innocence in this picture. We can't always have our fancy camera with us every where we go