Overall: this skin, is so nice, I may end up having to do a custom Naga Sea Witch model just for this skin, just because... the warcraft 3 model does it no justice.
pros:
this skin is really, really nice. that fin is nice, the green in it is nice, the shapes in the fin is elegant and nice, the skin texture in her humanoid regions is soft, pale, fishy, and feminine all in one which is sometimes lost in naga female skins due to scaly or creepy effects.
the face is nice, her red eyes are a strange but welcome variation compared to most nagas yellow eyes.
her stomach looks just great, and so do the tails sides. the gold in general looks well just simply great.
cons:
the eyes color being red isn't a bad thing, and neither is the gems being red, the problem is both are the same color and I feel its somehow not right. if the gems were red and the eyes blue, or any variation of color really other then both of them being the same, it would look better, the reasoning behind this is her 2 eyes are horizontal to each other, and the 2 gems are both vertical of each other, and while this symmetry for the eyes and gems are neither bad, somehow they are too similar, both in size color and orientation.
a solution could be to perhaps merge the 2 gems together into 1, or to shrink one gem and expand the other, or to change their color to complement her skin tone and not compliment her eyes. or to change her eye color. many alterations are acceptable to fix this issue. and this is mostly just my preference.
the bow feels a bit plain, any way to try to make a gold bow over a dark blueish weird color bow? the concept art you show cased here shows her with a big elegant flamboyantly decorated bow, which while impossible to for you to texture, the bow texture you made could be worked on a bit imo. I am not so sure what to suggest here, other then more gold color shapes and symbols.
the snakes seem oddly blurry, the original eyes weren't as bad about their alignment, may want to look into that.
over all this skins pretty sweet. I vote it 8/10 one of the better naga skins iv ever seen and liked alot.