This is what a photo collage should include. It is two pages of photos that show you with children you have cared for, your hobbies and interests and your family. It is done lengthwise on an A4 page, so it is easy to scan and display and every photo has a description explaining what it is about.
Please do not put on photos of children on their own. Anyone can cut those out of a magazine. A family wants to see your interaction with the children.