How to change guest account picture in Windows 8 PC

Step 1 open your computer local disk c -> click view in menu bar and select the hidden file box like

                               

Step 2 open program data->Microsoft->default account pictures. Here you can see the guest profile pictures.

Step 3 next you can replace your selected pictures under the name of guest.bmp and guest.png then close the files.

Step 4 finally your guest account picture was changed..