Disclaimer: Tolkien's the genius, not me.
They listened to her tales of Beleriand avidly and without interruption – until she tried to describe Menegroth. “It was dug into a great hillside beside the Esgalduin, and carved with the aid of Naugrim from the Blue Mountains…”
“Naugrim?” repeated Olwë’s son, brow furrowing.
Elwing blushed – of course they would not know! – stammered a description. “They are the Stunted Ones, but strong and clever with their hands, and they’re – hairy…?”
But in the end paper and graphite was called for, so that Elwing could attempt a clumsy drawing so that her hosts might understand what, approximately, a Dwarf looked like.