well, i can give you a basic shape or the whole shape if you like....it's for me not that hard to do
o and what i said about that faces thing....this is what you should do:
1.First create a sphere ,this will be the basic, then make a second sphere a bit smaller then the first one. Put it inside the other sphere(just move it to the center) and then andd a cube, the meaning is that this cube will cover the parts that you want to be gone so make a cube as width as the opening in the front should be. This cube also need to come out in front of the sphere like it must cover the whole part you want to be deleted in the front. Then you must 3.make a cilinder that tou put at the bottom of the sphere but just as far in it that it sticks out at the bottom and it's top must be in the second sphere you made....it also should be just as witdh as the cube you made and should be placed at the half of the cube(so it looks like a cube widt on round side).
2.Then you select al these objects except the big sphere(base), you go in your toolbar in hte upper part of your screen to the polygon tab and press combine.If that's done your not far away from the basic shape, just deselect the combined thing you made. And select first the big sphere and second the combined parts. Then go in your menu bar (file, window that bar) go to polygon and then click the boolean>intersect. now you should have your basic shape you see.
3.then you can make two cilinders to make holes in the ear parts of the helmet, and you can add cilinders and rings(i forgot the name) to make the thing in front of it. after that you must make a good texture and render it....
i will make a usefull tuturial out of this in a few days i will post a link here.