Hello! We understand the need of restoring those photos. Here is how:
1. Go to Settings > iCloud > Storage & Backup > Manage Storage, then tap the name of your device to view a list of iCloud backups.
2. Check the date of the backup you want to restore, because you'll be restoring only what iCloud backed up on that date.
Here is more information: http://support.apple.com/kb/PH12519?viewlocale=en_US
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