There are lots of posts here where people have supposed hens that become roosters at a later date. I've tried sexing chicks here and I'm not fully certain until at least two months old. Okay, I'm not very good at it, partly because I don't really care what sex they are.
The people who are better at this though will need better pictures. try and get the whole chicken in the shot. Comb and back (hackles) is helpful.
With regard to hand feeding, I always do it. I get them used to being touched this way. I touch their beaks as I feed them. It's like a handshake. It may seem a lot of trouble now, but when you need to catch one in a hurry because it's sick or injured it starts to make more sense. Anyway, it's a nice thing to do.