Updated.
Ryumaru: Took your advice and upped the colour count. Still under 16, so I'm happy, and it's loads more smooth. Also, I pumped up the saturation a bit on the red.
Helm: Done and done, I think. He seems a bit more centred now, anyway.
InvaderLupus: Done.
Feron: Carelessness on my part
Fixed...?
Zach: Revamped the whole abdominal thing. Still probably off, but I took a shot at it, anyway
SolidIdea: Altered the jaw a bit. Shield stayed the same, but I think it's just a stylistic thing. If it's something a lot of people are seeing, I might change it (and I might anyway, as I've noticed it more and more now that you've brought it up), but not for now.
Thanks for all the crits, guys. There's been a ton of useful info here and I think I'm learning something. Either way, I'm outside my normal style a bit, which is always good. Keep it coming!