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davidcyclebackTo me it would depend on where the painting was displayed. Apparently McDonald has provided paintings for the Heisman Trophy club, Universty of Oklahoma and the Baseball All-Star Game. If your painting was made for such prestigous display, that would more than make up for the lack of it being painted by McDonald. Any time a painting has been displayed in a museum or at a university or such, that will raise the value significantly.
I would contant McDonald Enterprises and see who/what the painting was made for. If it was for the All Star Game or such display, you would have no financial concerns. This information may even raise the value in collectors' eyes.