A few years back, working for Pearson Learning Group, specializing in educational material. I was asked to demonstrate the ability to portray children and people of various ethnic backgrounds. I thought I'd do both. The above with pencil and watercolor.
One of my assignments was to take a textbook written in Australia and adapt it for an American audience. Most illustrations in the book needed ethnic substitutions and disabilities represented. My instructions were typically: "Make the child with the beach ball Latino and the girl on the end needs to be in a wheelchair".
It was a fun assignment, and lucrative. I'm sure the idea of the assignment would make my current co-workers seethe with PC indignation!