Hi
If you had iCloud backup turned on before you got new iPhone.
Go to settings on iPhone down to reset Restore iPhone back to factory settings
Set back up over your wifi when it asks if you want to use iCloud backup Say yes
But choose a backup from when you had your photos.
This will only work if you had iCloud backup turned on before you got new iPhone
You can also use ipad back up if you have one.
Cheers
Brian 🇬-1F1E7;