I was very lucky to get a shot at a test sculpt by Werner Klocke, an outstanding sculptor and a good friend.
He was the person who really started me off with sculpting humans and especially faces, his work includes multiple companies including his own (freebooter miniatures) as well as reaper miniatures.
This was a test piece, unfortunately I was not successful (I did it about a year ago) but to be honest, it's the sculpts you don't succeed on that you learn from more than the ones you get right.
As an additional tester I've included a link to the sculpt that he did for this character and the artwork and you'll see what I mean.
Werner's first mate sculpt.