Hello Sridhar.Hr , probably the safest way to add the layout to the image is importing it "offline". Once you have captured the image, you can mount it with DISM (dism.exe /mount-wim /mountdir: /index:  /wimfile: /checkintegrity) and you can then use the Import-StartLayout cmdlet providing the mount path in the -MountPath argument.  Another possibility is saving the layout xml file somewhere in the image before the capture, and than adding a first logon (RunOnce) command in the Unattend.xml file: PowerShell Import-StartLayout -LayoutPath 

 -MountPath C:\
 Regards, Mattia  
Windows 10 1709 Start Layout  icons are missing / does't load for new user profiles once captured image, but while using powershell export layout and import no issue works
Windows 10 1709 Start Layout/ icons