This is based off of the original from the Comic that was released and passed out at major computing events to promote the game. The actual cover illustration is darker (it must have been brightened in PS) and the face has a few minute changes.
If they scanned this off of a Comic Book cover then they actually modified the picture quite a bit. The most notable change is on the original cover, she was in jeans, not a swimsuit. (You can see the line where they cut it pretty easy) Also, her legs were positioned VERY different.
If I had a scanner I'd upload the cover I have. :(