If you're planning to do arm and leg armor, I think the gargoyle head would look terrific on elbow guards or knee guards. 
The "winged" theme seems to call for upward sweeping lines. The "V" of the decolletage fits that theme IMO, but the lines of the breast coverings somehow feel "off". Don't have a suggestion for something better at this time, sorry.
I'd suggest keeping the high collar of the cape. Deliciously evil. 
The horizontal cutoff of the abdomen fabric - it interrupts those sweeping lines. Maybe gathering the fabric at a central ring, letting it flow away to the sides (and up over her breasts maybe) could be an idea?
I'd guess a long skirts with splits up to the hip, or maybe a long loincloth, would be a good complement to the outfit. 

By the way, I think that helmet would go just GREAT with the Abyssal Queen outfit from DAZ. Gotta try it one of these days, when I have time...

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