If you were syncing Contacts and Photos to iCloud, have you gone to Settings/Your Name, signed in using the same Apple ID, and in iCloud, turned Contacts and Photos syncing on? The iCloud sync is very slow. The photos sync is extremely slow. It could take several days or more for the photos to sync.
Do you have a backup of the lost phone you can restore from? Restoring from a backup erases all data currently on your device. Any data newer than when the backup was made will be erased. A restore is an all or nothing restore. You can't access a backup to see the contents and only restore certain files.
Backup - Restore your device from an iCloud or iTunes backup.