Very interesting history, thanks. I do not know much about cossacks, so following your thread is quite educational!
Just one remark about the eyes. I know it cost you a lot of effort, but for me just raising the iris does not quite work. I think it will look odd after painting, because of the natural shades that will be next to the raised part. My suggestion would be to leave the irises as they are, but to also raise the rest of the eyeball. The original eyes were a bit to deeply sculpted in my opinion, and this will correct for that. I hope It is clear what I mean Martin. And feel free to ignore my comment...!
Cheers,
Adrian