After sculpting the vitrinid snailien, and getting some great feedback, I decided to try again. Here's the works in progress so far. One is a power armoured version of the Hhurrk low-tech reptilians I posted earlier, and the other is an insectoid. Not sure if either will be castable(?). I've also gained a greater appreciation of the professionals ability to make a range of figures that look alike - I doubt I'll be able to make more that look the same.
The insects still have the arms to get added, and I think I'll add some sort of staff to support the spindly legs which still need trimmed down a little.