Not bad, it's got a nice heavy feel about it. One tip I'd point out is to use a mirror with it. It helps highlight differences in the symetry and enables you to get a more evn look to it. Good work so far.
Wow, if that is on a rubies armature... then... lol I believe the improvement is approximately 500% better. The worst part of bio helmets is the symmetry. Just keep at it, keep looking at it, have other eyes on it. That's all I can think of.