Looks very nice Glenn, I especially like the shading style, it combines a nice color research with environmental input such as specular regions and self-shadowing.
Mostly when rendering such things, the input of analoge colors with a small contrast of complementary colors finishes it off quite nicely

But I have got 2 suggestions.
1) The bracelets of the female character should receive more specular terms.
2) For the WIP head, I would personally give the character blond hair to match the outfit

But when looking at all your elements, I can state that it matches perfectly. Keep up the great work!

Cheers

Frazzle