If he asks for the child's photo means he still concern and miss the child. By looking at the child's photo he knows how is the child getting on. For what reason he doesn't want to meet, you may have the answer. My 2 cents worth is you should send the child's photo to him.
I feel you. I’m in a similar situation as you. The father don’t care but at least the grandparents make the effort in meeting up with the kids. I won’t send the kids picture to them. If he really wanna see them, he could easily just asked to arrange a meetup.
Don’t send photos to him