Depends on how heavy the pictures are.
I use the 3M Command Velcro Strips for a couple of pictures and plaques in my coach. They have been in place for almost 2 years and have never fallen off the wall. I do use at least 4 on each, one on each side and one or two top and bottom. When the picture is moved they release without damage to the wall.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054