I think you have 3 roosters and one hen.
The colouring is no indication of sex. The only guide is the comb size. Can you get better photos? From these photos the combs look very pale, they should be brighter red (especially the roosters).
They do look very cute! Their colouring looks a bit like the 'blue' grey Japanese bantams. The roosters will be very handsome! Do a internet search of the different colours and see what you think.
The colouring is no indication of sex. The only guide is the comb size. Can you get better photos? From these photos the combs look very pale, they should be brighter red (especially the roosters).
They do look very cute! Their colouring looks a bit like the 'blue' grey Japanese bantams. The roosters will be very handsome! Do a internet search of the different colours and see what you think.