Here is one I did for a friend of his daughters

Here is one I did for a family. All the girls are sisters even the older one with the phone. Let me know what you Think!

HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

Personally, I think the photo is a bit unexposed, and I'm not a huge fan of the desaturation. It kind of looks like the girl's eyes are closed and she's making a face? And are the water bottles supposed to mean anything? I would suggest putting all the pictures side by side as oppose to tiny and on the picture of the oldest one.

maybe make the older one tiny and the others bigger

All of the photos look great except the big one. I'm not a fan of the destaturation in this application. The bright vibrant colors work in the 3 small shots.

First that comes to my mind - she looks tired. Bring colors to her

Agree with the main photo being too desaturated and the look of her looks pretty bad. Also don't like how she's smack in the middle of the shot. Cut off the right side of the bench if you have to.

Instead of overlaying the 3 kids photos onto the big one, just lay them all side by side next to each other with maybe a white border between the pics. Would look a lot better IMO