I don't know about the LVT-2's, but if I remember correctly someone came up with a picture of two LVT-4's on Omaha beach a couple of years ago. I believe it was on missing-lynx forum and it was a picture taken a few days after D-day from the see towards the beach.
Alex
p.s. It seems the LVT-2's at the Omaha beach museum have finally "died". I don't remember seeing them on my last trip to Normandy, last year.
edit: it was this thread..
http://www.network54.com/Forum/47208/message/1089310983 sadly no picture anymore