Conversation so far:
When did Thomas Eakin's early career start?
Eakins' early career started in 1871.
What kind of works did Eakins produce in his early career?
Eakins' first works upon his return from Europe included a large group of rowing scenes, eleven oils and watercolors.
What was Eakins' most popular early career work?
Eakins' first and most famous is Max Schmitt in a Single Scull (1871; also known as The Champion Single Sculling).
What is a Single Scull?
The Single Sculls is an 1871 painting by Thomas Eakins, Goodrich catalogue #44 that celebrates the victory of Eakins's friend Max Schmitt in the October 5, 1870, single sculls competition.

Question: Why was this a popular painting?
Self-contained rewrite: Why was a Single Scull a popular painting?