If they are older than 10 weeks, they'd be pullets. Most single combed birds have this in common, the males show themselves with large, red combs and red wattles at 6-8 weeks. These birds are starting to redden up, but this is the age, 11 weeks, that's when the pullets also do this, especially the top laying hybrids. Since they often begin to lay at 17 weeks, they mature quickly, but never as quickly as the cockerels.
The also have dainty legs. That's usually a good female sign as well. I see red ear lobes, I believe. In most birds, that means a brown egg.