This looks good to me, but I would contact Phil Sears on this one. Just type his name into google.
He is an expert at Disney autographs and focuses entirely on Disney. I believe it costs $35 to get his opinion, but he will be able to tell you whether this is authentic and probably a history on the piece.
Also, Michael Wehrmann I believe has a very good reputation. He is a main supplier of autographs at Tatooine Traders in Disney's Hollywood Studios.
But yeah, I would definitely contact Phil on this one.
Pretty much the exact same piece and Phil gives a real good detailed analysis on what it is. I would say, if authentic with the custom framing, around $3,000 would be fair.