White in silkies is almost always recessive. There is a separate dominant white gene, but it is usually very leaky--allowing other colours to express in certain areas. Recesive white is very much not leaky. If a bird has two copies of it, you have no idea of what other genetic colours or patterns are present in the bird. Every bird can be different--but they will all be white because of the recessive white gene that does not allow pigment to be placed in the feathers.
The bird in the 1st photo appears to be lavender. The bird in the 2nd photo appears to be black.