Hey, nice stuff... sexiest lines I've ever seen!:P
Seriously, though, this is coming along really nicely. I've only a few crits, and I did a small edit to help illustrate, 'cause sometimes my mouth-words don't make so much sense:
One of (maybe the only) major thing I changed involved shading. In certain places (like the top arm) some of the AA was done in a way that made the area seem blurry. The diagrammy thing to the right of the edit isn't the best example (ptoing made a better one a while ago under a post by Ego, and I'm sure there are others floating around), but It'll work. AA is meant to smooth out areas, and when you do it like it's done in the
x'd version (just pile lighter colours on top of darker ones) it just makes lines appear fatter, and blurry.
The other thing I did (hopefully) was make the light source a bit more consistent . In your version there are, in places, some weird things going on. In some places, for example, you have the brightest highlight beside, like, a midtone or light shadow and it just kind of makes for jaggies.
I also agree with Eyecraft about the palette; the ramp seems a bit inconsistent saturation wise. That's a personal choice though, I think, and it's really just fine the way it is, so... I dunno, take that for whatever it's worth.
This is looking hot, and the improvement from the original's pretty significant. Good stuff.
Oh, and thanks for the colours! I love seeing other people take on my lines