While in some pics it may not look it, the Darth Vader model is actually far from being finished.
One of the things I'll do while working on a model, is to mock up the different parts and then assign them a base color similar to what I'll want for that part's skin, an extra added glossy shine over the solid colored armor pieces help them stand out more, and sometimes I'll even put together a temporary texture,... that way I can get a better Idea how the model will look in the end.
If I were to show a more factual representation as of how Vader looks right now, it would appear more like this.
http://wat.midco.net/eggnog1/vader-wip.jpg)
I'm not sure just when I'll get back to it either. Right now I'm trying to focus on the models that will be used in the mod first, then on the ones that might get used. Then, every so often, I'll sporadically work on one of the other models just for a break. But since Vader isn't a very high priority, I'll tend to only work on him when the mood strikes me.