Or as my nosey neighbor did; she had her son-in-law get up on her roof so they could see what we were working on. Then even went so far as to contact the zoning board when we were not doing anything illegal. A board member conveniently called us on a Sunday saying they drove by and happened to noticed we were doing some work on the back garage & to find out what we were working on & if we needed a permit Grrr..... Of course the back building can't be seen from the road. My hubby proceeded to call our neighbor & tell her to mind her own darn business & if she had a concern to ask us first. she backed off after that, but she still watches us with an eagle eye.
Oh gawd yes, this is our problem too. Honestly my back (complaining) neighbour must have the cleanest gutters in the town. Every time I start doing something in the yard out of the ordinary he is up cleaning his gutters.
Ours complained we were keeping chickens, then when that got them nowhere they complained about our rooster crowing at 5 am. Yes it was but even after we got rid of it their house lights were still always on at 5 am so it wasn't waking them.
For the OP the taking photos makes it sound like they aren't looking to do anything but complain. I'd make sure I had everything up to code so they couldn't. I would then start putting my six foot hedge in!