Some more updates - a Kisufisu on the TGA forums pointed out that the upper right arm was sort of off - and having looked some more at the troll, I agree. So I have two different versions, I'm happier with, but I'm having trouble deciding - any opinions?
Just a shot to show how creepy the faces and arms are - I'm really getting a "The Thing" vibe here, which I love:
Also, I've been working slowly on a Warlock Engineer for the Skaven warband - here's a sneak peek of him so far: