My aunt has passed away. She did not do hijab in her life but I have a picture of her with my deceased father. I mean she used to wear hijab when going outside but she didn’t do hijab in family functions or non mahram relatives. I want to post that picture as a tribute to her. Can I do that? Would it be a sin that im posting her picture without hijab on social media where na mahram would also be there? Its just as a tribute that I want to post her picture.

From a fiqhi perspective there is no problem but it's better to avoid such