Use Rokar's Camera to record the images of 8 Iron Dwarves in Dun Argol, then return to Scout Vor'takh at Camp Oneqwah.
8x Iron Dwarf Images Captured
Now we have to finish the job of making you as repulsive as those iron dwarves.
The best way to do that is to base your disguise on the ugly mugs of real iron dwarves.
When Tormak's hunting party discovered that wayward prospector, they took the camera he carried. Now, I suppose, we'll get the chance to use it.
Take it with you to Dun Argol, kill some iron dwarves, and record their likenesses in this device. Bring it back once you have enough examples.