You can set it to show a picture from your photo library, a stock photo selected by Windows ... lock screen. You can't configure them separately. This means, however, that if you're looking to ...

Customizing the various features on a Mac computer can be ... Keep in mind that if you change your desktop background in the future, it will replace your lock screen image with a blurred version ...

You can set a timer to change the background picture automatically ... color on title bars and windows borders. These settings let you personalize your Lock Screen and lock screen status.