Ask the family.
Only personal experience is this:
A couple of months ago, my cat died. Not an accident-- expected-- cancer. I cannot look at my photos of him right now because I still miss him so much. But I am glad I took them and they are there. I have not taken them down. I took one photo on his last day. I adore the photo because it captures his fierce will to live. The last month was all about balance -- honoring his determination to live while not letting him suffer. I shared photo with the 2 vets who helped us at end and some friends. I will probably never put it on stock but some day, it will be included in my art portfolio. I do not mind it if someone buys photos of him-- he was my heart and soul once in a lifetime cat. The idea of others appreciating his photos, other than that very personal one, would make me happy. I just would like maybe not to see them a lot as part of my personal life at this point in time.