Use Quick Start during setup and choose to transfer data from the old iPhone
Use iCloud Photos and sign in with the same Apple ID on both iPhones
Use AirDrop to send selected photos from one iPhone to the other
Use a computer to import photos from the old iPhone, then sync them to the new iPhone
Use Finder on Mac or iTunes on Windows to back up the old iPhone and restore it to the new iPhone
Use Messages or Mail to attach and send photos to the other iPhone
Use a third-party cloud service like Google Photos, Dropbox, or OneDrive and download on the new iPhone