Hi it would be good if you could get photos of their backs as well so we can see if they are spangle or opalines.
As for sex I would say male, hen, hen, hen.
Your three hens should also be opaline as your male is opaline so all his hens have to be opaline.
Are they cage or colony bred? Because if they are colony bred any of the males could be the father.
The first one looks to be a spangle skyblue dominant pied, the second a green spangle dominant pied and opaline if hen, the third is a yellowface opaline skyblue dominant pied possibly spangle can't really see her wings properly and the last one is a yellowface skyblue spangle opaline. They are all very pretty.
Cheers Jenny