It's technically stalking and harassment for you to receive pictures from any source if the parent doesn't want you to have them.
This is incorrect. If Sallywally is being sent or given the photographs by friends or other family members, without her actually asking for them to be sourced on her behalf, she cannot be charged under the Harassment Act 1997. However, if she were to post those photographs on social media, for example on her Facebook page, that could constitute harassment.
However, "repeatedly sending presents, when asked not to do so" could be considered harassment and so cease if asked to do so.
I think we need to be careful, when advising others that the information we offer is correct.