Hmm, it's a bit hard to tell if I'm seeing male specific feathering or not.
So do you mind getting another picture closer of the area I circled? Slip your hand underneath the feathers so it's easier to see their shape, and take a picture.
If the feathers are long and pointy, its a cockerel...
I don't have one of those, but if you post a picture of yours I should be able to sex for you, as long as he/she isn't too young, that is.
How old is he/she?