I directed this commercial in October 2009. We had a dozen nine year olds running around Washington Square Park in Manhattan. We didn't have any lights or use bounce board, relying strictly on the natural light at 9am on a Saturday.
Check it out:
Camera work is a little off (slight moves in shots where it should just be locked down). It looks okay, definitely the "no lighting/bounce" thing isn't something to be terribly proud of.
It's nice to see commercials with great child actors. I think they performed very well for you, as opposed to looking in the camera, not paying attention, ect. I agree with the comments about over using DOF (as pretty as it may seem to have all the time) and the double frame. Make sure you set your shutter speed to 1/50th (for 24fps) and leave it there. Just adjust your aperture and ISO to compensate light. Using programs like Magic Bullet Looks could sweeten the color as well.