Well, yes, that's why I don't see some people complain about Vol'jin's unique features like his ears and tusks. Having unique features add more character and makes important characters stand out. They are still a part of the troll's specific features, but unique.
The trolls in the pictures I linked have very unique features as well, and were also drawn by Blizzard's own artist as original concepts.
I'm not saying your ideas are bad, Ramz. They look really neat as well, but there is really nothing that have to be changed in his current design. It is a very good design which makes him stand out.