I found this thread today. Although it is several years old, the pics look just like my Lemon and her reddish/pink features that appeared on her face.
https://www.backyardchickens.com/t/...k-pullet-or-cockeral-pic-heavy-refresh-if-big
My initial concern was not gender in the least. I was more worried about an allergy or worse yet an infection that could spread to the rest of my girls. It appears it is just normal development for RIR's at this particular age. One of my other girls started to get a little pinkness around her eyes last night too. No more panic, they are just growing up! I am also pretty sure they are all pullets due to the lack of growth or coloring in their combs. All still small and pale yellow.
I had one cockerel who was one of the last birds to develop comb and wattles. I was hoping he was a big pullet but no, his hormones eventually developed. He is definitely a cockerel. But he developed several weeks after his brothers. I thought he was a pullet for the longest time, and almost put him in with the pullets. Was glad I decided to wait a couple more weeks before moving him!