How to Change the Login Screen Background (picture ) on Windows 10 ISO by autounattend.xml

I want change Lock Screen Background picture By Registry Value :
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PersonalizationCSP]
@=""...

How to Change default Lock Screen Background to Windows iso ?

how to Remove the following tasks by default through Windows Registry Editor Version ex : task.reg

i am Working in Building Custom windows Iso and How i Change Default theme to My new installed theme...
I mean Default Windows 10 theme is aero and how i can change new installed theme..?

I want change the default theme, Using setupcomplete.cmd
Is the registry file correct?

Windows Registry Editor Version 5.00
...

How to Add default theme with Windows Registry Editor Version

How to Customize OEM Support Information in ( Windows 10) ISO
I add. Logo to Windows inside the ISO file using the power iso program
sources\$OEM$\$$\System32\ OEM logos