The crests are just starting to come in at that age. You can see the start of them.
Seeing actual quality takes until they grow up. I only cull for faults at early ages. It takes until they are well over 6 months for me to see who looks good. I usually wait until 8 months.
There is such thing as crests that are too big. This is too much. Poor girl walks into things all the time. Usually me as she stalks me.
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She's beautiful. My chick named Rudy stalks me, looks like a mini version of your.