Paint peel on bathroom ceilings happens a lot. My theory is that it happens when it is originally being painted. Because there can be so little air-flow in a shower cubicle drying time can be very slow indeed.
After good preparation and the covering of the first coat I make sure it is all nicely dry with a hair-dryer or an electric paint stripper on a low heat (holding it about a foot away from the surface - obviously)
I forgot to take finish photos.
The exterior walls were still looking the worse for wear from the Halloween festivities.
Also front door and garage doors were to be repainted.