I think a 8ft fence is in order. Least if he gets on a ladder to take the pictures theres a better chance of a fall and broken hip. I get along with my neighbors. I have lived here for almost 7 years and talked to the old guy next door 4 times. Other neighbor is nice and I say hi to him about 12 times per year. new neighbor behind me has exchanged looks and thats it. Other young couple is OK. Guy hunts and fishes. Always invites me and never comes through. Long as he stays quiet I really don't care if I ever go fishing.
Now my last house was a different story. I had beagles and a pit bull. Both wanted to get out of the yard so I put up an electric fence on the inside of my chain link fence. Lady who owned the rent house next to me complained and asked what if the children get shocked. I told her then they should not have reached into my yard. I had a neighbor(renter) come over and asked if we had found their food stamps once. I was getting poor reception on my cable and one day found that the renters had spliced into my cable. Called the cable company and they didn't care.
Oh wait I'm a bad neighbor. Can't stand other peoples animals jumping my fence and eating my dog's food. I got them to stop.