So one small change i'd like to suggest, is the location of the wings on Sithian females. Having them up on the shoulders, while potentially 'pretty', doesn't (TO ME) make much physical sense, especially since they can use said wings to glide.
I just imagine a sithian woman gliding with the entirety of her serpentine body dangling like a janky semi-colon.
I finally found some art that fulfils what I had in my head, with the wings starting at mid-"hip" and extending down to about mid-"calf", where their center of gravity would logically be, allowing for a more 'streamlined' gliding experience (plus, to me at least, looks gorgeous, plus said wings can lock in someone to force an eating out! >.> )