^ if your ps3 is connected to the internet, the game gives you an option to upload the pics when you go to showcase. you upload to EA's website, then you go to EA's website under ProStreet and there is a link to locate your pics. login in to your EA account and you can see the pics you uploaded from the ps3. then just download and upload here.
edit here is the link under find your photos:
http://needforspeed.share.ea.com/Default.aspx