Warboss fan art, art experiment part 2

Hey everyone! That's the second experimental art with a combination of oil on canvas underpainting refined in digital (the first part is here if curious: https://www.reddit.com/r/ImaginaryWarhammer/comments/1o3xgx6/oc_techpriest_art_experiment/).
I've been using pencil and charcoal sketches as a base since my early fan art but never dared to bring the oils in.
My biggest issue with digital is that I find it annoyingly sterile. What simple pencil does in few strokes program takes pile of tunes to imitate and the result is not always the same. I always wanted to have this nice traditional, human made touch to my artworks for a better communication with viewers. I've tried a number of software but non of them gave me the desirable result with a reasonable workflow, what eventually pushed me toward oils. So here are some results upon your consideration.
From the firs attempt feedback I had been suggested to take orks as a subject and I thought why not, The design here is pretty grounded, iron jaw, crude metal shoulder plates, hydraulic claw, crude axe... you know all the things orks love. So my goal here not to go deep into crazy design (I can always do it later) but rather create some very underground look and feel similar to art from the first redactions and rpg games of the 80-90s.
Probably you don't have to know all that, but for the sake of contex I decided to share some "kitchen".
I still in need of a feedback as to me that's a new experience and I'm kind a groping for the good results. If there is something you don't like or think has to be improved feel free to speak out, all as well as to suggest the subjects of further paintings.
Have a good time!