A picture from the side would be better. Also, what type of comb does it have and what color are its legs? I'm not good at identifying breeds, but these are questions the experience people will ask.
Hey! I'm back! It turned out to be a white jersey giant! My chickens are a year old now and I just got new ones, a barred rock(lady),a buff Orpington(comet), and a golden laced Wyandotte!(piper)
Could you post a picture of your white jersey giant, my 5 week old chic looks just like yours did, grey head and white wings, getting whiter every day...