Is this for Haldir, or Merry/Pippin? Or Boromir, since it was alluded that a restock with updated head sculpt may be coming in another thread?
If it's Haldir - obviously, hybrid hair is great as we have discussed. Sculpted/molded up top and rooted hair for the length to allow for unrestricted posing. Same as you did with Legolas.
Obviously, his armor and red cape as shown in the Battle of Helm's Deep. His sword, bow and plenty of arrows for his quiver for the weaponry. He's a master archers and needs plenty of arrows. He wouldn't need many other accessories since we didn't see him with much on screen.
If you're going to make Galadhrim archers the way you made the prologue soldiers to go with Elrond - I think a nice touch with be the grey capes that they marched into Helm's Deep wearing, and the Galadhrim banner we saw them marching with. It would be cool to recreate the scene on display where Haldir arrives and greats Theoden. Again, plenty of arrows for their quiver.