If your photos are not being backed up, picture backup may not be enabled.
Enable Photo Backup:
Open the Lookout app
Select the menu button and then Settings
Scroll to and select "Data to Backup"
Make sure that the Photos option is switched on
If this doesn't work, you may need to reset the Lookout app:
Uninstalling and reinstalling Lookout will force the app to detect any changes to your camera-storage location. Instructions to uninstall the Lookout app can be found here.
Note: Lookout only backs up photos as large as 12MB. Lookout does not back up photos taken with 3rd party apps (e.g. Instagram) unless they are stored in the default camera folder.