Edited by Traceaskew - 3/19/16 at 10:02am
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From what I can see, they look like pullets to me as well.
Silkie males are tall, lanky, and can have more mowhawk type crest, and will have a large walnut comb.
Females are squatty, rounded, and have a pompom crest with very little comb.
But I defer to the other poster regarding show quality crests.
Seeing these new pictures, the comb does look pretty boyish. It also looks like there are streamers popping off the back of its crest
Here are a couple of pics of one of my roos to give you an idea of how girlie they can look:
He was a couple of months old in the first two pictures.
I thought he was a girl.
This was when he was around four years old. I couldn't find any in between pictures, sorry.