I was floored when I saw this bust. The face is just so life like, even just primed you can see character in it. The detail of the hair, beard and cloak is reaaly nice and probobly the best treatment of this that I've seen. The brooch is just superb and worthy of note as well. The helmet though........blah. All that detail and you dropped the ball on the helmet in my opinion. There is nothing to the occular and the skull is just so plain. This warrants some work on the helmet and a quick redo of some research will pop up some pretty elaborate trimmings, furniture and decoration to helmets like this. Based upon the work in the brooch, I think the helmet warrants similar attention.
Now, that being said, I think it a crime to hide that face behind an occulared helmet. I know that if I get this bust, my first job would be to toss the occular and fashion either a nasal or just leave the skull.
Yuri, you rock as an artist and I wish I had the talent of your failures. This is one of the best I've seen to date.