Here are some more ideas for the cover. All photos are from Shutterstock and iStock.
I thought I’d try this typeface. Its called Learning Curve Pro.
http://www.fontsquirrel.com/fonts/Learning-Curve-Pro
Conclusion
I didn’t think any of these were particularly successful apart from the ones with the mother and daughter in white. Even those weren’t very engaging and lacked colour. This last idea here looks like a postcard. It’s not a problem, I just need to make more ideas.