One or two areas of the sig look a little slow signed but that's his autograph so I lean towards authentic. He is not a great signer but loosened up in Hollywood promoting stuff this Jan. I even saw him get his beard shaved on kimmel. I would like a Braveheart mini poster myself!
Thank you for your opinion :)
The seller told me it was while the appearance in Hollywood, he put a picture of Mel Gibson the day he signed it had that beard ^^