I see the improvement on the chest scars, now they seem more recent/fresh than before.
Also the improvement done on the face is very good IMO, red reflections were nice before, but now (that I can compare) are more subtle and "credible" so I like them much. Have a look on the
last bust that AndyG painted, the skin there makes me think of yours, the difference I would say... is definition, that looks even more defined and crisp than your orc.
All I can say for you to improve the bust now, is about the bear? claw. It can be a photo issue though. It looks dark, too dark maybe and it seems to be missing some highlight work, but as I say it could be the lighting of the picture. You'll know this better than anyone looking through a monitor
Also the NMM gold around the blue gem/stone could be more shiny, and if so, it should reflect that red light from the left, at least a bit. At the moment I cannot see any red reflection on (might be the angle of the picture too) on the golden rim, although I see it on the "silver" metal "shoulderpad".
But this is just me trying to find something to help you improve further an excellent work, and I am no pro at all, so I could be completely wrong. Hoping to help here! :S