My clients were art galleries. A show would come and go and all kinds of holes would be left. Get over it. I swear I know where all 4,000,000,000 are in one place but you will never see them if you walked in.
Plunk the photos you have nearest each other. If the photos do not match. Stretch the wire. Or move the anchor.
Really, look at the image I provided and imagine how many holes in walls have come and gone.
Use tape or something and a real painter may kill you.
Meanwhile? Put a hole in it. Wrong place? Move it. If the picture covers your mistakes you are in great shape unless someone moves the art piece. 30 years later in your home. Within 30-60 days in an art gallery.
Then you patch it, prime it and paint.