First off, could you render bigger resolution pics, like 1280x980 px? These are too small to really pick out small details.
Second, add some perspective ones too.
Now, so far: you have segments on the side "walls" of the head base that you really don't need (you really need only 3: the two end ones, and that one in the middle for the top portion where it drops after the bridge dome). Also, the sec hull bottom dome has too many segments, same goes for the spherical part of the head, more than you realistically need, I'll get back on you on that one, I can explain what to do with those two better with pix.