You can use nearly any combination of Raspberry Pi SBC and display for this, but a very nice, compact, photo frame-like option is the Pi Foundation 7" touchscreen display plus the Smarti Pi touch pro case/stand.
If you're using the Smarti Pi case, here are the official assembly instructions.
Be sure to insert the microSD card you prepared with the operating system before assembling the case.
Once, assembled, plug in a mouse and keyboard to get things set up initially. You can later unplug them for photo frame use.
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