The panorama looks like the original was not exposed correctly do to the grainy look of the panorama.

The panorama is missing too much of the foreground. You have only the tops, a wider lens should of been used to get more foreground or rotate the camera to the portrait orientation.

You have to be careful as too many 6 mega pixel images even with 2 GIG or ram you can end the stitching with a out of memory error!