1. Reverse the elbows. The originals were too weird for me. This was an easy fix achieved by switching the left and right arms, and cutting the impaling spikes off at the wrists, and turning them around. A little bit of green stuff modelling putty fixes all the gaps.
2. It turns out that compared to other gargantuan creatures in the Hordes game, the Blightbringer is rather small (there is not a lot of body to back up that huge mouth). I built up a large rocky outcropping out of putty to elevate the Blightbringer, so that it appears comparable in size.
And a work in progress, which gives a better sense of scale:
More works in progress, with a couple hints about what is to come...