( 1) Create a new admin account in users and groups .
( 2 ) Log out primary account from apple logo and then sign in with second admin account .
( 3 ) Click on continue .
( 4 ) Don’t sign in with your existing Apple ID and password , click on set up later .
( 5 ) A pop up window appears are you sure you want to skip signing in with an Apple ID ? An Apple ID is used to automatically set up the iTunes Store , App Store , iCloud and , more .
( a ) don’t skip ( b ) skip , click on skip
( 6 ) The box of enable ask Siri is checked by default , click on continue .
( 7 ) Choose your look ( a ) light ( b ) dark click the desired option and click on continue .
( 8 ) Setting up your Mac ( three right check marks will appear ) .
( 9 ) Click on system preferences > accessibility > mouse and trackpad > trackpad options , check the box of enable dragging with three fingers drag and click on ok .
( 10 ) Click on Go > Computer > Macintosh HD > Users > click on primary admin account > Downloads , select the photos , copy them ( use command and C keys ) and drag and drop over the desktop .
( 11 ) Open photo application and click on get started again drag and drop each photo from the desktop into the application .
Another method is to transfer photos between two admin accounts in a Mac .
Click on finder > Go > home > your user name > pictures > Photos Library.photoslibrary just right click on it and click on show package contents > click on masters folder ( in new version the name will be different ) to get selected , copy the complete master folder ( use command and C keys ) , again close the finder window , click on Go > Home >( paste use command and V keys ) over the shared folder .
Photos can’t be transferred directly from iCloud to an external hard drive for that you need to set up iCloud photo library see the article Set up and use iCloud Photos - Apple Support
And its preferences Change preferences in Photos on Mac - Apple Support , open finder > Go > home > your user name > pictures either drag and drop Photos Library.photoslibrary to an external hard drive , the second method is right click on Photos Library.photoslibrary and click on show package contents in the upcoming column , you can also drag and drop complete masters folder to an external hard drive that is connected .
Also as per the article Back up the library in Photos on Mac - Apple Support
- Manually copy your library to an external storage device: Drag the Photos library (by default in the Pictures folder on your Mac) to your storage device to create a copy.