1,2, and 3 are under exposed making some of the whites look gray. Bring them up about 1/3 to one half stop and they pop a lot more.
The alst one, I dunno. Maybe you are trying to show too much when the shot should be about the mom to be only, the surroundings are competing for my attention. It is also slightly tilted, the column behind her should have a lean the opposite direction you have it due to the way it's designed with a taper.