Conversation so far:
What was David Thompson like as a person?
David Thompson was plainly dressed, quiet, and observant.
What else was noticeable about David Thompson (explorer) appearance?
David Thompson's figure was short and compact, and his black hair was worn long all round, and cut square, as if by one stroke of the shears.

Question: Did he have any other distinguishing features?
Self-contained rewrite: Did David Thompson (explorer)have any other distinguishing features?