Only thing i could reccoment here is find some extra spears and fill up that remaining 8 points. it's very useful tp get them supports where you need them as your guys will fall fast when they start to loose combat.
The army is very squishy with the average defence all round and will often need to play the long game and skirmish about the place to whittle your foes with bow fire before any fighting.
i couldn't really suggest anything to add to the list if you wanted pure GC, but i think a wizard with blinding light (Gandalf, Cirdan, galadriel) could help to defend against enemy shooting. Or Malbeth with his 5+ invulnerable bubble.
Best thing really is to play test it
It's a cool looking force but very much a one trick pony.