dude, that cosplay, while the best I have seen so far, is not as accurate nor as good as something that is made from plastic, you know, with the molding and stuff. Also, your arm cannon looks good, but if you are planning to straight mold that or whatever, I would suggest a bit more refinment, as it's mostly uneven in little places, litte stuff, but stuff that will come out and will be hard to fix, it looks good, just that it needs polishing.
Ps. Samus' armor is still female looking, as evident in the fact that the stomach area and hips are overly curvy, while master chief's armor is bulky throughout, making it look manly.