Okay, took another pass at the Tsi-Hu head to make it more humanoid:
Reminds me a bit more of the Protoss. I was thinking more towards the heads overall size and rear area/cranium being a bit bigger or going further back before having the quills start (especially in the first of the three quarters full pose concepts, it was rather small).
For the eyes, maybe half way between the two, to let them keep the feeling of avian/peripheral vision and a more angled streamlined look while still having the sense of frontal depth perception. It's nice if you can lock eyes with them from the front, but it's also good if they read like a predator or something staring at you as if you might be its prey.
For the jaw, the more aggressive angle of the mouth from the previous frontal/side sketches was nice, though also kind of small as far as a mouth goes and didn't make it feel like something that would be eating other creatures or tearing off pieces of flesh to survive. Even modern humans look to have better jaws to that one by a notable margin, for biting into and tearing off strips of meat or chewing stuff, that angle is mostly good for the attack or pulling off strips of stuff but not chewing. And mastificaiton is a great way to get more out of the food you eat (especially with plants or other harder to digest foods). Maybe keep the angle of the first one and its sharpness towards the front, but keep the idea of it being a bit bigger from the second one so as to make it still feel aggressive, but to also feel like something they could regularly eat with rather than just attack. For the armor covering it, not sure if it was not covered in the first one but if kept covered like in this newer piece them perhaps leave a seam or indent for the mouth so they could open their mouth more easily even with some armor plates or such on the face (that's part of what gives this one the protoss vibe imo, not having a visible mouth). It'd make them look more agressive while having a slightly broader and tougher looking face/jaw.
Man, now I want to get out my tablet and start doing some sketches but for now I've got to get some other stuff done, so maybe later. Thanks for taking the time to read and respond to some of the feedback that's been posted by me and some of the others btw!
EDIT:
Tsi-Hu:
The new version gives off a more savage esque feel and its build has enough features to infer that it does have intelligence but I can't tell if its armor is part of its own body or something it puts on (this needs to be made clearer).
The whole body looks like its been through augmentation and turned into an armored cyborg, especially the feet.
As for the mouth in the chain coil thingy... what the devil?!
Omniframe:
The spine doesn't look like it can handle the weight of the frame and the feet looks like it needs to be a bit bigger and wider
If I recall the Tsi-Hu armor is biomechanical in nature and grown and grafted onto the users, though still capable of being removed as needed so not permanently fixed together. So the bony armor bits could be genetic modifications to the Tsi-Hu, or armor plates/clothing that they put on and it connects to them, effectively turning into a symbiotic organism.
On the note of clothing:
I think armor platings could be used instead of cloth to polish out the individuality.
from the artwork it seems the left arm has a "manmade" structure whereas the right one looks more natural.
Armor plating would most likely be organic, boney, or such in nature given their culture. Solid metal plates could be worn as clearly separate clothing items not grafted onto them and so more identifiable as clothing to us, and while it does convey culture/tools/and certain other parts an armored shell, suit, or simply hanging some shoulder plates or other such things over them won't add to the mystery or concealed feeling quite like some cloth or cloaks would. That mystery vibe that you get from a concealing piece of fabric was part of what I liked about the first concept. Metal armor plates tends to feel more bold, like its being put out their to show directly to those present that you are expecting to take them head on, and doesn't give that mysterious feel. When you see a metal plate you tend to read it as armor covering part of the body, but a cloak or fabric covering something loosely tends to make a person think more about what its hiding, since we think about whats its there for and unlike metal that we think of mostly as being for protection or armor the cloth wont suit that as well and would lead a person to think more about its uses for concealment.