I used to proxy a Duinhir model for my Arnor army using the Halbarad profile to represent a historical Arnor character (Aranarth, the first Chieftain), but now find myself in the position of having to make my Arnor force Tournament compatible.
That means no proxies, and considerable conversion work to distinguish it from a Duinhir model being used as Duinhir.
I've decided I want to turn it into a Captain of Arnor, with bow and possibly a shield too (the shield will help distinguish it as using the Captain of Arnor profile. Otherwise he might be mistaken for a Dunedain/Ranger of the North).
As Duinhir is a Ranger model, this will make a suitable leader for a Warband of Rangers.
I can easily add a round shield from my plastic Gripping Beast Saxon Thegns. The chainmail that Duinhir wears can arguably pass for heavy armour (models in SBG are inconsistent as to whether chainmail = armour or heavy armour).
However, the Captain of Arnor does not have an option for spears, so I will have to remove it. But Duinhir's right arm looks like its at an odd angle and would make posing difficult. I could remove the arm at the elbow, and take a plastic forearm from my Saxon Thegns but what sorts of poses would work? Should the arm be outstretched to his right? Should it bend at the elbow with the sword stretched forwards?
Also, how should I go about sculpting a beard onto him?
but I liked to think he was a descendent of Numenor and kept the shield as a family heirloom. 
). I attached a pouch and dagger to his belt (taken from my plastic Gripping Beast Saxon Thegns). And covered up his face with a greenstuff mask.