Okay, not sure how that's happened, but your veemodel variable has some how been set to "inf". Were you using any mods? As I've checked the code and can't immediately see anywhere where that should happen.
As is it, I've uploaded an edited version of the model.rpy file with a fix. Drop this into your game folder and then go to the photostudio and view the replay of Vee's second shoot. This should reset the veemodel variable to 2 and allow you to continue.
No idea if this will fix anyone else's save, but if you're having issues with Vee, it's worth a go.