In reply to aln:
Did you read the T&Cs when you bought the gift?
Boots Photo Terms and Conditions
6.5 Notice of Defects
...
(3) Please note that only technical inadequacies, which were avoidable with the technology available is considered a defect, but does not include aspects of personal taste.
Differences in colour between the images and the original image data are not a defect.
http://www.bootsphoto.com/boots/termsandconditionspopup
Also,
> The original photo is his Grandson standing in in a pile of bright orange and yellow Autumn leaves.
Are you talking about a printed image or viewing the image on a screen?
If printed, was it printed by Boots? If so then you may be able to persuade them that it was reasonable to expect the jigsaw to look similar.
If it's on a screen then have you calibrated it? If not then you may be looking at images differently to everyone else, including any photo printers.
Post edited at 09:03