If I understand correctly, one of your boyfriend's personality fragments believes it is Thanatos, the Greek God of Death. And you are asking whether you can use a picture of your boyfriend to represent Thanatos on your altar. If I am mistaken in this, please correct me as it will make a difference in how I answer your question.
If you are working at your altar with a particular deity, in this case Thanatos, then the item you use to represent that Deity is there to help you build a connection between yourself and the Divine. That item can be a statue, a picture, or some other thing that speaks of Thanatos and Death to you. The more clearly the item links you to the Divine the more powerfully you build the connection.
So, using a picture would normally be fine. However , understand that no matter how much your boyfriend believes that one of his personality fractions it is the embodiment of Thanatos, he is not Thanatos . All of his personality fractions remain human. So, in this case, using your boyfriend's picture on the altar might work to create a connection between the two of you, it will do nothing much to create a firmer connection between you and Thanatos.
Rather than use a picture of your boyfriend on your altar, I would suggest that you look on-line for pictures of some of the statues of Thanatos from ancient Greece and use that on your altar instead. Because those statues had a history of actual worship even a picture of the statue already has an energetic connection to Thanatos. I think you might find that works better for you.
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