There isn't at the moment. Generally some pictures won't be unlockable in one playthrough. I did think of adding in a new game plus. But that would be an undertaking on it's own (since it requires a little bit of planning and I actually had an idea of how I wanted to do it as well)
It will come eventually, but not just yet.
There is one more glitch that I found Brittany 3rd weigh gain picture does not appear in the menu screen but it shows just fine in the mirror. And this last one may be a glitch? Her sister Tiffany gains weight faster then her sister and it seems faster everybody else as well just to let you know so you can take a look if you want.
