wow dude thats really taking shape, nice and low poly too!
one thing you will learn at some point though, is that you dont always follow your reference 100%. this is the case with the neck. youve modeled it to the ref, which is great. however, you should start the neck a little lower than the ear, it looks a little weird on the model right now
edit: also, you should bring his face forward, so his chin is further from his neck, cos atm he wouldnt be able to breathe, let alone fight..