Hmmm, well, I guess I should throw my own two bits in here.
What about Jacobson's Organ? I always wondered if other nagas have it. My prick-assed Raison does, and a forked tongue, and actively uses it when he actually goes hunting.
Also, the snake body. Realistically, Crisis and Vivian's and most other female nagas would find the boobs cumbersome, because it would tip their balance foreward and make it hard to move into whatever little space there is on Felarya. Humans have two legs to anchor themselves and spread the weight evenly, nagas have a tail that tapers. Not good when you have extra weight sticking out of your chest and gravity.
But that's just me, and I'm NOT a nineteen year old who is in college, a thirty year old, or anything else. This is just what I have gathered.
A short thing on the cold blooded thing, Raison literally is cold blooded, but he's got black(absorbs heat) 'hair' and scales and stays close to the part of the trees where sun filters through, and spends much of his time sun baking. Sure, it's not exactly good logic for something the size of him, but at the time I assumed it would work just slightly.
The unrealism of this paragraph appalls me.