Okay well to me, the Breastplate has the mpst work in it already and the helm. If we make a design that follows the style of those, it might be something like this: (Please forgive the rough and rushed nature of the paintover). So you might decide to do something like that. OR you might feel like that doesn't get across…
I think more than the sculpt, which seems pretty competent for an early attempt (though I'm not sure this would be an easy one to retop for games), the character design is the issue here. The armour doesn't really have a cohesive look in terms of culture and technology, and also doesn't really make sense in how it stays on…