First off, welcome to the board!
Second, looks like folded it properly and got the shape of it right.
I must ask though, did you scale it down before printing? Keep in mind the Master Chief stands about seven feet tall, so to just print it out as is will make for a helmet far too big on your big. You'll get more of a "bobblehead" appearance in that case, lol.
So far, it looks good. Just what sort of "advice" were you looking to get on this, though? Regarding what aspects of your build?
EDIT: Check out the "Official Pepakura Scaling Thread" stickied at the top of this forum if you haven't taken the scale into consideration (if you already thought of that, great!). Once you're ready to go further, refer to the "Resining Tutorial" also stickied here to brush up on what you'll need...