The crest on the face. if you see a space in the nose its a boy. The third pic is a girl as you can see. there is no space in the nose area. if I remember right. if the crest is oval its a boy. if its circular its a girl. It could be the other way around I dont remember
he looks like a fairly young roo just wait he'll blossom before your eyes!! from what i see he looks really good just doesn't have his adult look yet and i bet he will surprise ya when he does!