After getting some great advice from Brian about modifying the measuring board to add bungee cords to hold the fish down. I really liked this idea of freeing up one hand to take quality pictures without worrying about your fish jumping off. There are many ways that this can be done to accomplish the idea to suit your own needs. I know that the way that I rigged mine is different from Brian's and Chris Payne's but it was the same concept that I adapted.
First I bought a pack of small bungee cords with the metal hooks on the ends. I cut one end off and burned it with a lighter to keep it from fraying. I drilled holes large enough to pull the cut end of the bungee through and tie a knot so that it doesn't pull through the hole and the knot doesn't show. I stretched the bungee to about a foot cut small notch so that the hooked end of the bungee easily be slipped into the notch while trying to hold a fish on there.
So far the "X" pattern has worked well for me and has served its purpose. I know some guys like to use a criss-cross look and others prefer one strap across the middle. The possibilities and adaptations are endless so I encourage you to toss some ideas around and if you see that losing fish is a problem for you then hopefully you will find this helpful.