If the new owner isn't an active member, just joined to buy a doll, or doesn't post pictures and you aren't trying to convince people she is still your doll then I don't see any ethical dilemma at all.
There certainly is no legal issue either, as already said, the photographer retains all copyright of his/her photography with the exception that the subject have a copyright on their image (Personality rights), but even this is a commercial copyright so unless you wanted to sell the photos and the doll in question had retained Personality rights (not the doll's owner), you have no problem.
Agreed, if the new owner was posting photos of her on the forum then requesting permission would be the decent thing to do, unless you know them personally and know they won't mind.
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