You are correct, you should be able to see a bit of the boys neck... my son kept dropping his chin to his chest trying to do his best Bounty Hunter pose. One thing to keep in mind is that this particular helmet was made just a tad on the largish size to accomidate for extra growing room. Other wise, your son would only be able to wear the helmet for a few months to a year at best
My son seen wearing the helmet the pictures, was 5 at the time. So with that in mind, the helmet was designed to fit kids up to the 8 to 10 year old range ( depending on how big your kids are that is ).