I am not that up with copyright laws ( especially in another country) but I know that students who reproduce the Masters place a notation on the back of their work denoting the original piece it was copied from.
Perhaps, as it isn't for sale, you could place a label on the back attributing the photo to the photographer, or the to the doll's producer as the advertiser, and state on there that it is not for resale or reproduction. I know its for a friend who wouldn't do that but circumstances change, and items change hands among family members too. So by doing something like that you may have covered your own behind.
I am sure that others here will be able to give better advice.
What I always did when I was starting was base my work on a photo from a magazine or the newspaper but use it as a base only and made the work my own. I might use a pose from one pic and the detail of a hand or mouth or whatever from another - basically I had some Frankensteins going on, but it gave me photos to work from without copyright being something that I had to worry too much about (believe me, by the time I had finished withthem their own mother couldn't recognise them

).
Hope that is helpful.
Sue