ermm.. well theres nothing like automatic... you cant just do it with a click or anything.. and automate everything...

lots of steps involved... basiclly...

1. put a white frame for ur pictures...
2. copy pictures into main canvas..
3. disort the pictures to look like real phtos.. e.g. bend... perspective...
4. add lighting.. imagine where there should be light and where not...
5. finally add shadows... behind the photos lah of course..