Toca Hair Salon 2 is automatically set to not save your snap shots to the camera roll. You'll have to go into the app settings to change this manually. To access settings on your Windows Phone, go to the "For Parents" button at the top left side of the app's start screen. Scroll down and you'll find the settings. Turn on save pictures.
To access settings on your Windows pad?, swipe left from the right hand side of your screen and the settings menu will show. You can access this setting from anywhere in the app. From here, turn on the photo savings function and you're snapshots will be saved in the "Saved Pictures" album on your device.