My Silkie girls never did get any comb-like growth at all... I see some walnut combs beginning on those Silkies... Anyone else venture to guess?
the only way I knew was looking head on at my boy - he began to grow that purple comb... and a few weeks later, he crowed. My pullet never had any growth like that, and since then, I brought home a two month old Silkie as a companion. This one too, has nothing resembling a comb between her eyes so I'm real darn sure it's a girl too.
I see on one or two of your Silkies that really look like boys...