great work on the brute conversion. and overall a good paintjob. a few soft critiques though, hope you take them with the good intention I'm sending them.
- the skin parts look solid
- the soot stuff is strong
- the metal edging on the foot/hand claws does the trick if you're aiming to make the darker original metal look worn at the edges
- the horn bones around the face look unfinished. maybe it's the lighting but it looks like a bit more definition through washing or brown layer lowlights. followed by bone highlights would do the trick
- the biggest issue is the gold/brass trim of the entire model's armor. It appears as though you painted the gold before the blue because of the blue splotching. else if you painted the gold after, the splotching would then be intentional but doesn't convey the weathering (if it was the intention)
I think it's a good base but could do with some wash + layer + silver or bright gold edging. trust me it will bring your blue to life and clearly pop the various sections of armor
anyway, just my 2 cents. a very enjoyable piece though. great work.