Decided to post this.
It's a WIP, so feedback is greatly appreciated atm.
What I want with it is to make it look like an armored corpse, but subtly; the 'face' is more like a neck-guard (or whatever), the ripped-open chest has folded hands to look like part of the ribcage, some of the sinewy muscle/skin layers of the armor looking like wrappings etc.
It'll have an ability fleshed out later that'll involve it turning into a Sarcophagus (trying to incorporate that in the armor as well.)
Don't steal, this artwork and concept is mine, although Warframe belongs to Digital Extremes.
UPDATE: Made more progress