You can't upload graphics in, you create them in the built in livery editor.
that plate looks great ren. I can't wait to put some time into it and come up with some designs.
Here's a pretty sweet skyline r33 replay video from le mans on youtube. The sounds are amazing, I'll be crankin that up on the surround sound
http://www.youtube.com/watch?v=NfgoVs6m4kM&hl=it