This is a wonderful idea. The children are beautiful, but the noise on the faces, hands, and arms is very distracting. Otherwise, I would have scored higher.
they're adorable. i wish the girl's hand didn't obstruct the child on the right's face. her dress being isolated by contrast is a good idea. imo, though, there's too much noise, especially in the face of the little boy on the left of the photo.
Not only contrast in color, but illustrates a contrast of cultures as well. I'm not sure I like the grainy appearance of the boy's face on the left, but that's a minor thing.
If the "subject" is the red elements on the girl's dress then this meets the challenge. However I doubt that was the intention in this picture in which case it fails to meet the challenge since there is very little to separate the girl at the front from the other three children. Additionally there is a partially cut of head at the top of the frame that looks very bad.