To be sure the mural paint will adhere well to the existing wall paint, scrub the surface thoroughly with detergent and then carefully rinse it off with clean water. Then you should test the mural paint adhesion by applying some onto a small area. Let it dry for 24 hours, then try to peel it off by affixing Scotch tape to the paint and quickly pulling it off.
My problem is that I'm seeing a narrow band of surface adjacent to the upper edges of the parts with very little or no primer, far less than on the flat surfaces or edges. It looks like gravity and perhaps the air-knife blow-off (for blowing out holes and reducing drip-bead on the bottom edge) are causing the wet film to slide down the surface slightly, leaving the bare band.