
I'd advise against following the one in the concept actually. It's just barely reminicent of the ravana at all. :\
You've got a decent start there, couple of things tho: 1) Kill the smoothing, please! It adds weird detail where there is none and hides it where there is. We want to see her facets! (same goes for the hecate for that matter

)
2) You've got it mirrored along the Y axis - probably why people had trouble spotting which part they were looking at.
3) Go for the sharp-crab-armour-over-soft-internals look - since that's the impression the original model gives. It's a bit of a shell sandwich.

You do appear to have started in this direction, which is awesome. Keep it up!
