Life's Journey in a book

I came across a tutorial that taught me how to utilize various composition techniques in photoshop, not having access to all the photo's they used, I found my own and employed them. I titled this graphic Life's journey in a book. The younger couple on the left are walking toward the sunlight, as the older couple on the right walk into the sunset of their lives. You can find the original tutorial here if you would like to try it out.