Worked on this a bit more since the eye arrived - inserted the Tech Optics eye, painted the distorted eye to match, glued on the wig and cut and styled the wig.
I'm using a Gregory wig, which is the standard when doing Arnie busts, as the T-1000's hair is VERY similar to Arnie's in the movie. I ordered a shade lighter than the wigs I've used for Arnie though - normally an 8 (Light Chestnut Brown) is used for Arnie - I've used a 10 (Medium Golden Brown) for the T-1000.
Of course, the wig is a real pain - the bullet hole in his head means the shape is really awkward, so the wig had to be partially glued down, then sliced and stuck down in sections.
Anyways, here he is at the moment:
Since taking this photo I've worked on bringing the hairline forward/down a bit more at the "widow's peak" and have added the eyebrows. Both hair and eyebrows still need tweaked further, and eyelashes added, before he's really done.