Some serious improvements here, from the beginning to the last mini.
I think you have a good general perception of the proportions, and luckily for us, the sturdy body of chaos dwarfs, along with their taste for full armors, come at hand in this. Hard to say if something is slightly off place under some scale armor and a proper curled beard.
IMHO, one thing you should focus now, is in the “finiture” phase.
Which, unluckily, the green stuff is a bit tedious, but can be done, with some patience and skill.
Like, for example, hard edges, or flat surfaces. You will have figured out that freshly mixed green stuff is very gummy, and you won’t probably sculpt anything straight or precise out of it.
But as the time passes, GS will start to cure, getting more and more firm. If, as the time pass, you get to redo that sharp edge (like and armor plate), you will notice green stuff will react better and better. At one point, you will need to push hard with the metal tool, to form that sharp corner, but then you will be sure that the GS will retain that sharp edge once fully cured.
Also, for surfaces like skin, clothes, etc etc before they get too hard, try a pass on those with a brush an some white Alcool. Try to smooth the little bumps, irregularities and so on, following the “flow” of the sculpt.
If you have some around, a little tip of Vaseline on brush/tool is brutally effective in smoothing green stuff. Then you can wash the Vaseline away with white Alcool. But this is not strictly needed, is just a trick some sculptors use.
It’s boring and tedious, the cleaning and smoothing, but thrust me, you will see difference at the end.
Keep up the work!